Middlesbrough midfielder Didier Digard faces 12 weeks on the sidelines with the injury suffered in Saturday's goalless draw against Wigan.
A visit to a specialist has confirmed a partial rupture to the quadriceps muscle in his left leg and a tear to the medial ligament in his right knee.
The 22-year-old Frenchman was carried off on a stretcher at the Riverside following a legitimate tackle by Boro old boy Lee Cattermole.
Middlesbrough manager Gareth Southgate said afterwards: "If I was on their side I'd be thinking he timed it just about right.
"Unfortunately Didier turned into him and got caught."
Copyright (c) PA Sport 2009, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms