Rocky Elsom is in doubt to play for the Brumbies against the Waratahs on Thursday night as he has a recurring hamstring niggle.
Elsom has been named in the Brumbies team and if he plays he will make his debut for his new team but he is rated at a 50-50 prospect.
Brumbies coach Andy Friend had planned to give the blind-side flanker a quick burst of 20 minutes game time at Canberra's Viking Park but he is also wary of risking further injury.
"He's touch and go to be honest," Friend told AAP.
"He hasn't strained it, it's just an ongoing issue that he's had for probably the last three years.
"It's linked to his back and it feels tight and there's the chance of aggravating it and we certainly don't want that."
Elsom played for six seasons with the Waratahs before leaving Australia to play for Leinster last year.
Elsom should know by Tuesday whether he can line up against former his former team mates and back-row partners Phil Waugh and Wycliff Palu.
Mitchell Chapman has been put on stand-by for the 49-Test forward, who turns 27 next week.
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