Blackburn Rovers have confirmed that Leon Best has suffered cruciate knee ligament damage, leaving the striker now facing a six-month lay-off.
The 25-year-old was stretchered off during the first half of Rovers' 2-1 friendly victory over Greek side AEK Athens at Fleetwood on Sunday.
A scan has revealed damage to the Republic of Ireland international's anterior cruciate ligament.
Best had scored with a brilliant strike just minutes earlier and had been earmarked by manager Steve Kean for a key role in Blackburn's bid for an immediate return to the Premier League.
The forward only arrived at Ewood Park from Newcastle for £3million earlier this month.