Nottingham Forest boss Billy Davies has revealed that Dexter Blackstock will require surgery on his injured knee.
The striker picked up a serious problem during the latter stages of the Reds' 2-0 victory at Cardiff on Saturday.
He has since been sent to see a specialist and undergone several scans, with Forest keen to establish the full extent of the damage.
They have yet to be given a full report from medical experts, but Davies admits the outlook appears bleak.
"It doesn't look good," he told the club's official website.
"We sent Dexter to see some specialists yesterday (Tuesday). We're still waiting on some scans and reports but what we do know is that a hell of a lot of damage has been done.
"It certainly will be a lengthy period that Dexter will be missing.
"It certainly looks like he will have to have more than one operation."
Davies is disappointed to see Blackstock ruled out of his plans for the foreseeable future, just as Forest have found top gear, but the Scot accepts that injuries are part and parcel of professional football.
He added: "It's going to be a long haul for Dexter coming back but he appreciates that.
"You have just got to do that - as a sportsman you know that these things can happen."