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Speaking after a 35-0 win over the Melbourne Rebels, head coach Warren Gatland said both players would be assessed ahead of Saturday's contest.
He said: "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...
"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."
Source : http://www1.skysports.com/rugby-union/news/16057/8792096/Injured-Lions-Alex-Corbisiero-and-Jamie-Roberts-unlikely-to-play-in-second-Test