Mourinho has now spoken of his tenure in charge at United ahead of the clash and insists it is a "closed chapter", with his sole focus now on Tottenham and inflicting more misery on Ole Gunnar Solskjaer's struggling side.
Solskjær has won only four of 14 league matches this season in United's worse start since 1988-89.
One of the areas Ole hopes will help improve United's consistency is the return of several players to full fitness.
"I don't think whoever the manager of the opposition team is will change their motivation (of the players)", he said.
Manchester United keep failing to win matches, as this time it was Aston Villa who came to Old Trafford and took a point before their trip back to Birmingham, in a draw that had seen four goals scored.
Premier League bosses Unai Emery, Mauricio Pochettino and Quique Sanchez Flores have all lost their jobs in recent times, with Everton boss Marco Silva appearing to be on thin ice but Solskjaer denied being anxious about his own circumstances. We did our job, we won two matches - then we can not control. United have bagged just 18 points in the league, which is 22 short of league leaders Liverpool.
Guardiola: Man City are not low on confidence
Three players is not rebuilding a team . "That is for the players who have finished their contracts and the players who have them. Guardiola has previously admitted that the club could not afford to sign former Foxes defender Maguire last summer.
Mourinho, though, would not be drawn on the United manager's difficulties. But Solskjaer backed his players to turn things around, saying they did not need extra motivation in the form of Mourinho.
Mourinho has talked matters over with chairman Daniel Levy but said: 'I'm not going to discuss these individual things.
Seeing as this will mark the first time since his exit that he'll be returning to Old Trafford as manager, Mourinho would love nothing more to secure three point against the club that fired him and the man who replaced him.
"First 30 minutes I thought he was running the game, everything good coming from us was through him and that's not overlooking the whole performance".