British and Irish Lions head coach Warren Gatland has revealed that Alex Corbisiero and Jamie Roberts are unlikely to participate in Saturday's second Test against Australia.
England loosehead prop Corbisiero and Wales centre Roberts are struggling with respective calf and hamstring injuries that look set to take another week to heal, and Gatland said: "At this stage it's a little bit doubtful that they'll be involved."
Gatland revealed that Corbisiero and Roberts will be assessed on Thursday, when the team for the second Test at the Etihad Stadium will be announced.
"Alex is struggling a little bit and Jamie is probably in the same boat. Both of them should be fine for the third Test, but at this stage...," he added.
"We have a recovery day tomorrow when everyone's off. Then we'll look at seeing how they are on Thursday morning. The medics have been doing a fantastic job for us and they might be declared fit, but it's doubtful."
Gatland was speaking after the Lions routed the Melbourne Rebels 35-0 in their final midweek match at AAMI Park, with Conor Murray, Sean Maitland, Sean O'Brien and Ben Youngs crossing. Referee Glen Jackson also awarded them a penalty try.
"That was a good response to the disappointment of last week (14-12 loss to the Brumbies)," said Gatland. "We said beforehand it was an opportunity for players to put their hands up.
"Richie Gray had his best game on tour, Richard Hibbard carried the ball well, Conor Murray and Ben Youngs were good, as was Sean Maitland. The spirit really came out today, demonstrated by the way we didn't concede any points.
"There's still an opportunity for people to be involved because there are two games. Given the attritional rate, there are bound to be a few injuries between now and the final Test.
"Even if you're not selected or involved in the next two Tests, you can still feel proud of having been part of a successful Lions tour. That's what the aim is."