The Rebels will be without scrumhalf Nic Stirzaker for this week's Super Rugby match against the Hurricanes in Melbourne due to injury.
Stirzaker njured his ankle in the closing minutes of Friday's match against the Sharks.
The Rebels may however be able to call on prop Toby Smith.
Smith missed the game against the Sharks with a shoulder injury, however will undergo further testing throughout this week ahead of a return to full training and potential selection in the Rebels' side to host the Wellingtonians.
Stirzaker injured his ankle in pre-season against the Waratahs, and had displayed solid form in the Club's last few Super Rugby matches before experiencing this latest setback.
"It's disappointing for Nic, who has worked so hard to be fit enough to play a key role in our last few matches after missing a large chunk of the pre-season," said Bryce Cavanagh, Rebels' Head of Athletic Performance.
"At this stage we are unsure of the full extent of the injury; Nic will see a specialist later this week and the picture will be a little clearer then.
"He won't play this week, but at this stage we're not sure how long he will be sidelined for."
Backrower Lopeti Timani continues to edge closer to a return from a knee injury, and will hope to feature in both Dewar Shield and Super Rugby in mid to late May.