Both players trained on Saturday despite nursing groin injuries and could now be in contention to feature at Old Trafford.
“In this moment he’s struggling because he’s injured and we come to the Chelsea match to try to help the team but his physical condition was not good and then he had to stop and was not available for Juventus and is not available for tomorrow again, so now is to be physically in the best conditions," he told the media.
The 25-year-old has made just six appearances this term but suggested last week that he would be "back on the pitch soon".
Mourinho is optimistic that Lingard could face Marco Silva's side, having recovered from a groin problem which he suffered during England's run to the World Cup semi-finals.
Asked about his chances of facing the Toffees, the manager stated: "Can he help us in the next match? That is the question we have to answer tomorrow or, if we wait, one more week of stability for the work, so he can be back next week. So he's almost there."
Marouane Fellaini returned from the international break with an injury, missing the draw with Chelsea and loss to Juve as a result, but also trained on the eve of the game against his former club.