The international transfer window was officially opened on 11 June and that means that clubs can show their hands when it comes to new signing sessions.
Real Madrid is looking for an expensive revision, Ajax is facing the breakup of their talented young team and how does Manchester City build 197 points in two league campaigns?
With all that in mind, Sportsmail takes a look at 10 questions that still have to be answered this summer.
Many European clubs face a number of questions during the summer period
What should Manchester City strengthen?
Two seasons ago, Manchester City finished with 100 points. Last season they needed 97 points to win the competition. Really remarkable numbers.
But with Liverpool just one point behind them in the most recent campaign, city boss Pep Guardiola is well aware of the need to prevent complacency in an effort to strengthen their position as the best party in England.
David Silva will leave at the end of the next season, they need a replacement for Vincent Kompany and Guardiola continues to look for a long-term successor for the pivot midfielder Fernandinho.
Benfica & Joao Felix, Bruno Fernandes of Sporting Lisbon, Rodri of Atletico Madrid and Harry Maguire in Leicester appear as the most likely names at the Etihad Stadium.
The dominance of Manchester City cannot be taken for granted as an indication of eyes
How can Liverpool build on their success?
In their own country they came so close. A single point was what separated them from the Manchester City moloch.
The Champions League victory was deserved for a group that lost only once in the Premier League all season, but now they have to put their foot on the gas instead of on the brakes to end their waiting time for a league title.
They already own one of the best backfives in the world, Alisson and Virgil van Dijk were the difference makers last year. Trent Alexander-Arnold and Andy Robertson are among the best full-backs in Europe.
Matthijs de Ligt of Ajax remains interesting, given his ties with Van Dijk, while he strengthens options in the attack, with Lille & # 39; s Nicolas Pepe an option, an important point of interest with Daniel Sturridge already left and Divock Origi facing an uncertain future .
Liverpool must build on their Champions League success to cancel the national title
What awaits us for Chelsea?
In one word: nothing.
Faced with the fact that they can't draw anyone this summer, The Blues have already lost the lead actor Eden Hazard for Real Madrid in a £ 130 million move, which can have real repercussions on the side's fortune.
With a range of loan stars and young players available, Chelsea has no shortage of bodies, but will need large seasons of academy products such as Tammy Abraham, Ruben Loftus-Cheek and Callum Hudson-Odoi.
The uncertainty about the position of boss Maurizio Sarri – who is strongly linked to a return to the Serie A with Juventus – means that the coming summer will remain foggy in Stamford Bridge.
The prospect of a two-window transfer ban will keep Chelsea's transfer plans on ice
How does management uncertainty affect Barcelona?
Suffering from a 4-0 humiliation to Liverpool in the semifinals of the Champions League remains a big black point against the name of Ernesto Valverde.
In all honesty, he has had two since taking the lead: elimination to Roma in the Champions League last season and then what was in Anfield last month.
The club is actively looking for a team that can give them the desired Champions League title that has escaped them since 2015, with Ajax star Frenkie de Jong for £ 65 million.
De Ligt is another that they desperately want to sign, while the conversation about Antoine Griezmann refuses to disappear. Clarity about the manager seems to be the key to putting all other elements in place. Exclude Valverde and the rest must take care of themselves.
The uncertainty surrounding the future of boss Ernesto Valverde keeps the summer of Barcelona in the background
Will Real Madrid keep splashing the money?
When Zinedine Zidane returned to take the reins back at Real Madrid, it was clear that he wanted money in the summer.
A sad end to the campaign ensured that he wasted no time lifting the vote with a £ 62m move for striker Luka Jovic, followed by Hazard's £ 130m arrival. But the club's grand plans for a revision show no signs of delay.
Manchester United midfielder Paul Pogba is at the top of the priority list, while Christian Eriksen is also important.
The issue for Madrid is that they have to comply with Financial Fair Play and that means that players are sold to balance the books. Gareth Bale, Isco, James Rodriguez and Mateo Kovacic all come from Zidane's plans, but the hard part is finding friends for players who have long-term deals at the club.
The summer of Madrid stands or falls by moving a few big earners.
Zinedine Zidane is determined to close the gap with rivals by overhauling the Real Madrid team
Problems in paradise for Atletico?
It has already been announced that Griezmann will not wear the club's red and white next season.
He says he already knows his next destination, but for now football fans are waiting to see where it comes from.
Diego Godin, an old figure at the back for Atleti, leaves and midfielder Rodri is a top target for Guardiola in City.
The problem of Atletico and boss Diego Simeone is that they have to stay competitive and at the same time keep a team that wants to play for the club.
With much talk that Manchester United was toiled over goalkeeper Jan Oblak and had lost the backbone of Oblak, Goddess, Rodri and Griezmann were able to destroy the side like few other summers have.
Atletico Madrid could cope with a major renovation when stars like goalkeeper Jan Oblak left the club
Is Ajax confronted with a squadron demolition?
The Dutch giants were one of the stories from the 2018-1919 season when they defied all expectations to reach the semi-final of the Champions League.
Driven by a talented young core, Erik ten Hag's side was a matter of seconds away from a final berth before Tottenham's Lucas Moura broke their hearts at the bottom of the house.
Talented midfielder De Jong is already a confirmed departure, while there is a wealth of interest in De Ligt, Donny van de Beek, Andre Onana, Hakim Ziyech, David Neres and Nicolas Tagliafico.
For many, their prices may never be that high and the club could experience a windfall in the hundreds of millions. Given their success, there is a sense of inevitability that this group will go their own way.
Matthijs de Ligt leads a line of Ajax stars that generate a wealth of interest this summer
Will Juventus build a team to challenge in Europe?
Cristiano Ronaldo was brought in to win the Champions League for Juventus. Fact.
They had already won seven straight Series A titles before the mercurial Portuguese arrived in Turin. Three straight trophies in Europe & # 39; s main competition with Real Madrid before he arrived, there was a lot of hope that he could drag them to their first since 1996.
He took them out of jail with a hat trick against Atletico Madrid, but could do little to stop the elimination against Ajax. Now Juventus has to go again and give Ronaldo the right supporting cast.
Paulo Dybala, under the former boss Massimiliano Allegri, seemed ready to leave this summer and that may still be the case. They need to freshen up an aging defense, while talking about a return for Pogba continues to dominate the front pages in Italy.
Aaron Ramsey arriving at a free is smart company, but Ronaldo – who was seen asking the De Ligt to trade Amsterdam for Turin after the Nations League final – needs more to help him end their European Cup drought.
Cristiano Ronaldo was brought to Juventus to win the Champions League, but he needs help
But what about Conte … did Inter get the money?
Juventus suddenly looks over their shoulder.
Their former boss Antonio Conte has arrived back in Serie A in a rival dugout and Inter seems ready to make a splash in the market.
Their list of goals is a sign of the lofty ambition: Romelu Lukaku, Eriksen, Bale, Fernandes and others.
The door to the San Siro is expected this summer when Conte Inter wants to grow out of the top four hopefuls into championship candidates.
Inter Milan wants to challenge Juventus for the Serie A title under Antonio Conte (left)
Is PSG facing the choice between Mbappe and Neymar?
This will probably run and run all summer.
Should Paris Saint-Germain choose between Kylian Mbappe and Neymar – or can they keep both?
Both are capable of being the star of the show, but two do not fit in and the club – knowing that they must reinforce a number of other areas – can admit that they can no longer accommodate both.
Reports in Spain on Tuesday described a & # 39; divorce & # 39; hanging between Neymar and PSG with a return to Spain suggested.
The focus on their strikers will be the conversation of France in the coming months.
The relationship between Kylian Mbappe (left) and Neymar (right) remains a topic of debate
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