The forward, who has been playing on the flanks for City under Chris Coleman, limped off in training today after taking a kick.
Robbie Simpson, who has also been used a wide man is the likely man to replace him if the Maltese international does not making the team which will be announced at 2pm on Saturday.
With Stephen Wright back in contention, he could move Isaac Osbourne up to wide right and slot in the former Sunderland man behind him.