The Red Devils lost 2-0 to Arsenal at the Emirates this past weekend, and it was another match between Wenger and Mourinho that was not short of drama.
After impressing during the game, the defender admitted his excitement at finally making a start for the senior side though he was disappointed because of the result.
Mourinho said their cramped schedule, which includes a possible two further Europa League games, means they must win the tournament to qualify for next season's Champions League. "We have to chase the Champions League by trying to win the Europa League". At the Emirates, Mourinho gave a Premier League debut to Axel Tuanzebe, saying he was delighted by the 19-year-old's performance.
He continued: "I think Arsene Wenger is not a small manager, he's a big manager".
"When they play like that (defensively), they have to win". In fact, we have recently won at Middlesbrough, we beat Manchester City in the semi-final of the cup, we won against Leicester and today.
"I leave Highbury they were crying". We all have to play our games.
Asked if the squad believe that they can make a comeback, Aspas told AS: "I don't have any doubt". They were walking the streets with their heads low. It's nice for them. So to have that record of winning so many matches, to not lose so many matches, it's something that's not normal.
"I'm not really a fan of talking about myself too much, maybe others should judge (how my first season has gone)".
"So, hard to manage it but I think, in principle, the team was good, was organised, played to win and defended well."Arsenal were not better than us in my opinion but congratulations".
Jamie Carragher also branded United "embarrassing" for their record against the top six in the Premier League this season.
"We are in a situation now and we have to fight so let's see if tomorrow we can do it and go to the final".
Former United striker Michael Owen has been equally scathing of Mourinho's tactics in his first season at Old Trafford, as he suggested the club's fans may not tolerate such negativity for an extended period.