His inability to find top form contributed to the downfall of then-boss Mourinho, who was sacked before Christmas and replaced in the interim by Ole Gunnar Solskjaer.
Just maybe they could sparkle in the Champions League.
"They have all got their programmes to do over the summer", Solskjaer said.
United have not won for a month and have taken just eight points from the final 27 available to fall out of the race for the top four, eventually finishing sixth. "We expect them to be ready to go on July 1 when we start". One United academy graduate who has impressed this season, Scott McTominay, will start in midfield, alongside Paul Pogba, and Ander Herrera, who announced on Saturday that the match against Cardiff City will be his last one in a United jersey.
"It is not like when I used to play, us or Arsenal would win the league".
"It will take some time to close in on the top, we finished five or six points behind third, fourth and fifth and that has to be our aim", the former United striker said. These are good players who have been going through a tough season mentally and physically.
"We have got the Europa League, FA Cup, Carabao Cup to go for a trophy because Manchester United can't go many years without winning a trophy". That's where we are at the moment, we have to work extremely hard. "I've been in the reserves and we send them away saying "come on look after yourself" because you never know what the manager is going to do when you come back after the summer", Solskjaer added. "We will need some characters in but, of course, you see Mason [Greenwood] today, he is made for Manchester United and a player we will see a lot of". "David [De Gea] has got one year left and we want to extend with him and we're in talks, and let's hope it will get sorted".
As far as maintaining a pay structure adjacent to results, Manchester United have yet again proven that they are a club steeped in the culture of overpaying for talent - much like how they shelled out mega money in wages to Alexis Sanchez and signed on the likes of Ashley Young, Phil Jones and Chris Smalling to new contracts.