"We’ll cross our fingers and hope for the best”, with star defender Alex Rance suffering what Richmond fears is a "suspected ACL" injury on Thursday night.

The five-time All Australian left the field late in the third quarter of the team's 33-point win over Carlton after landing awkwardly on his right leg in a marking contest.

Rance's knee looked to buckle upon landing, with the premiership player immediately taken from the field in pain by the club's doctors.

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Speaking after the game, Richmond coach Damien Hardwick said the early prognosis was grim for the club's mainstay down back.

"It's probably a suspected ACL at this point," Hardwick said.

"It's incredibly disappointing, but measure of the man – you wouldn't know it by his demeanour. He's such an incredible person first and foremost.

"It's going to be disappointing if it is (an ACL). He's an incredible player and you hate to see those players go out of the game.

"We'll cross our fingers and hope for the best, but it's looking dire at this stage."

Playing in his 200th game, Rance went straight to the dressing rooms after hurting his knee, but returned to the bench to see out the match with ice heavily strapped to the injury.

"Of course, it's a challenge," Hardwick said of replacing Rance.

"He's obviously a champion of the game and he's one of the best full-backs I've ever seen … but these things can be overcome.

"It's disappointing to lose such a fantastic player, but it also provides an opportunity for someone else to get some games under their belt. We'll get to find a player.

"Are they going to be to Alex Rance's standard? They're certainly not going to be straightaway. It's very hard to replace Alex Rance. But it will give someone an opportunity."

Jack Riewoldt consoles Alex Rance after the match. Picture: Michael Willson