Sydney star Isaac Heeney could miss his side's clash with Richmond this weekend.
The 22-year old suffered a knock to his hip during last Thursday's loss to Melbourne and had to be assisted by trainers.
Heeney returned to the game but has pulled up sore during the week.
"Isaac took a pretty heavy knock to his hip on Thursday night and was pretty ginger just after it," Sydney head of football Charlie Gardiner told sydneyswans.com.au:
"He was able to run out the game, which was a good sign. He pulled up a little bit sore after the game and is being worked on by our medical team.
"He will likely train on Thursday and we hope that he will come up to play for Saturday's game."
In positive injury news, ex-Cat Dan Menzel could return through the NEAFL before the end of the month after undergoing groin surgery in December.
"Dan is recovering from a groin injury that he picked up about a month ago," Gardiner said.
"He is getting very close to a return to playing, we think he is about a week away.
"He will do some heavy training in the next week. He will most likely make a return through the NEAFL side."
The Tigers host the Swans at Marvel Stadium this Saturday night.
