The forward limped out of the Whites' draw with Brentford on Tuesday.
The game at Griffin Park was the former Leicester man's second appearance for Steve Evans' side since he was forced off during the draw with Derby County at the end of December. And while he managed nearly a full half in the victory over Bristol City, he was only able to last 18 minutes against the Bees before having to be replaced by Mirco Antenucci.
The Yorkshire Evening Post reports that the 24-year-old will undergo a full assessment, but is now likely to miss this weekend's FA Cup tie with Bolton.
While the news may prove a blow to Evans' plans if he wished to guide United on a cup run, it seems unlikely that he would have risked the New Zealander for the clash at the Macron Stadium had there been any question marks over his fitness anyway, especially given the cautious stance he has taken over bringing Alex Mowatt back into the first-team, following his spell on the sidelines (via Yorkshire Evening Post), as well as the club's current position in the Championship.
With 18 games to go in the league this season, Evans will probably need all of his key players available if the Whites are going to be able to claw back the 10 points that currently separates them from the top six.
And with Leeds being the lowest scorers of any side in the top 15, he certainly will want to ensure that Wood - his top goalscorer in the league this season with eight strikes - has sufficient time to rest to give him the best chance of being available for the Nottingham Forest game next week.