FREMANTLE has confirmed Nat Fyfe has a minor hamstring strain after the star midfielder left the training track in  discomfort on Friday.
The Dockers were completing a match simulation drill at the end of a gruelling two-and-a-half-hour session at Fremantle Oval.
Fyfe stretched to take a mark on the lead and pulled up gingerly after going back to take his kick.
The drill was coincidentally stopped at that moment for a drinks break and Fyfe went straight to the rooms with the physio trailing him.
He did not return as the squad resumed the simulation for another 10 minutes before the session ended.
Fremantle's general manager of football operations, Chris Bond, confirmed on Friday evening that the injury was minor.
"It appears to be only a minor hamstring strain," Bond said in a statement on the club's website.
"He will undergo the normal rehabilitation program for a minor strain."
The 2014 AFLPA MVP has had an injury-interrupted pre-season with shoulder surgery in November last year limiting his output.