The Western Bulldogs are nervously waiting on further assessment of Sam Darcy's left knee injury after the star forward was substituted out of the clash with St Kilda.
Darcy flew for a mark in the Bulldogs' forward line late in the first quarter at Marvel Stadium on Sunday night and hyperextended his left leg when he landed.
The 21-year-old immediately grabbed at the knee and lay on the turf for a few moments before getting to his feet.
Darcy hobbled off the ground and was taken directly down to the Dogs' dressing room for further assessment.
He was replaced by second-game substitute Cooper Hynes.
Darcy, the son of club great Luke, kicked 38 goals last year in a breakout campaign and added 14 as the Bulldogs' most prolific forward through their first five games this season.
Widely regarded as a generational talent, Darcy signed a four-year contract extension with the Bulldogs last December, which ties him to the club until the end of 2029.