The Welshman is practically at full fitness and has played a significant role this season, especially in the Europa League.
He may get another start against LASK.
Mourinho hopes Bale can continue to improve his confidence and rhythm with more game time.
He told reporters: "The only problem with Gareth is to get him to the dynamic and confidence of playing consecutive matches without any bad feeling, without any negative feeling or without any remembrance of the recent past where the condition was not the best and the fears were there.
"I think it is more about that.
"He is playing regularly, he has the chance of a physical evolution.
"Of course he doesn't need a technical or tactical evolution, he needs a physical evolution and to get into the intensity of matches and to get his confidence back to play consecutive matches like three matches in a week.
"I think it is more about that."