The Wales international has been out of action since damaging his hamstring against the Waratahs, while the England prop missed the 16-15 loss to the Wallabies after tweaking his calf in the first Test victory.
However, the two players will report for extra training on Monday as they try to recover in time for the final Test match in Sydney on Saturday.
"There are a few boys training on Monday and the rest of the squad have a couple of days off and we'll train Wednesday and Thursday," said assistant coach Andy Farrell.
"Alex Corbisiero and Jamie Roberts will go hard on Monday and, hopefully, will be right for full training on Wednesday."
The series is currently level at 1-1.