Arsenal fear summer signing Jurrien Timber could be set for an extended spell on the sidelines… after the former Ajax star was forced off with a knee injury in the Gunners’ win over Nottingham Forest

Arsenal fear summer signing Jurrien Timber suffered a serious knee injury in Saturday’s win over Nottingham Forest.

Timber made his snap competitive debut against Forest on the opening weekend of the season after arriving from Ajax earlier this summer.

But the versatile defender was substituted early in the second half with a suspected knee problem.

The timber has undergone various tests and analyzes as Arsenal medics seek to assess the extent of the damage.

But Mail Sport understands there are major concerns that Timber may have suffered a significant knee ligament injury which will keep him sidelined for months rather than weeks.

But the 22-year-old was sent off in the second half after injuring his knee

Injuries appear to be worse than first thought, and Timber could now face months of inactivity

There were initial concerns Saturday that Timber damaged his anterior ligament, but those fears remain unconfirmed.

Any news of a lengthy layoff will come as a blow to Mikel Arteta, who has been impressed with how Timber has adjusted to life in England.