The defender suffered an ACL injury during Derby's 0-0 draw with Aston Villa.
Derby's manager Nigel Pearson
"Devastated" Derby County boss Nigel Pearson admits he cannot be sure as to when full-back Craig Forsyth will be able to return to the first team, but has told the club's official website he is confident the Scotland international will bounce back.
Forsyth sustained an ACL injury during last weekend's stalemate with Aston Villa last weekend and is set to undergo surgery.
The 27-year-old picked up the same injury back in November last year, causing him to miss the rest of the 2015/16 season before making a return to training towards the end of the season.
And having already seen him bounce back once, Pearson is confident the defender has the mental and physical strength to do it again.
He told Rams Player HD: “I am absolutely devastated for him, we all are.
"For him to work as hard as he has done, for the entirety of last season if you like, get back to take part fully in pre-season and then have this happen is a real setback for him.
“If anyone can deal with it in a positive way, he will be able to do that and he will get as much support as we can give him.”
But while admitting that it is a blow to lose Forsyth, Pearson has declined to put a timeframe on his latest setback.
"From our perspective as a club, we have to be patient with him. To have a recurrence of a serious injury like that means that the timescales may have to be adjusted slightly.
“We have to make sure that when he comes back next time that he’s fit as he can be and he gives himself the best chance of avoiding future problems.”
Meanwhile, midfielder Bradley Johnson is a doubt for Friday's game at Burton Albion after injuring his knee in Tuesday's 14-13 penalty shoot-out win over Carlisle United.
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