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 started but could not complete the Lions' 23-21 first Test victory over the Wallabies in Brisbane due to a tight calf and Wales centre Roberts missed the contest because of a hamstring injury.

"At this stage it's a little bit doubtful that they'll be involved," Gatland said.

Gatland revealed that Corbisiero and Roberts will be assessed on Thursday, when the team for the second Test at 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 said.

"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."