Arsenal have announced that Jurrien Timber has suffered an anterior cruciate ligament injury.
The Dutch defender is out for the majority of this season with the problem in his right knee.
Timber was a recent signing from Ajax, with accusations that Arsenal boss Mikel Arteta mismanaged his injury.
"The doctors looked at him and they were happy for him to continue, he was as well," the Spaniard said in his defense.
Straight away in the first action of the second half he made a movement and it was a bit funny. We took him out straight after and now we have to assess him and see what he has."
A statement on the club's website read: "Further to detailed assessments with consultant specialists since Saturday, we can confirm that Jurrien Timber has sustained an injury to his anterior cruciate ligament in his right knee.
"Jurrien will undergo surgery in the coming days and will be out of action for a period of time.
"The support and expertise from our medical team and everyone at the club will now be focussed on Jurrien's rehabilitation programme, to ensure he recovers well and is back playing as soon as possible."
