From Mourinho's perspective, some United players gave him food for thought ahead of the Ajax game.
Sergio Romero showed Manchester United will be in safe hands in the Europa League final by saving an early penalty and producing many other great stops in a 0-0 draw at Southampton in the Premier League on Wednesday.
"I never saw that with Chelsea, I never saw that with Manchester United, with (Champions League semi-finalists) Manchester City a year ago.
He didn't play for three matches due to suspension", Mourinho saiud. I hope you don't kill me when you see my team.
Ajax started the season in the Champions League qualification rounds before a two-legged defeat to Russian side Rostov meant they dropped into the Europa League group stages, where United's campaign also started.
"A clean sheet is good for us - for defenders, for me and for the team", Romero said on Sky Sports 1.
Filling in for the rested David de Gea, the Argentina goalkeeper tipped aside Manolo Gabbiadini's sixth-minute spot-kick that was awarded for a handball against Eric Bailly even though video replays the contact was outside the area. I hope the fans support the team, forgive naivety and lack of confidence.
"Tells (Wilfried) Zaha to go slow, leaves (Christian) Benteke at home; I hope he goes soft on us".
The result had no material impact on United's season, given they were already guaranteed to finish sixth but Mourinho will have been concerned by injuries sustained by Juan Mata and Marouane Fellaini.
"Fellani hasn't got a tear but he's experienced enough to know he had a feeling".
Southampton manager Claude Puel refused to discuss his future at the club, which is the subject of speculation.
"They are 25 points behind Chelsea, they are no better than last season, they look pedestrian at times, and there is no excitement".
"Any team has a debrief at the end of the season and this is normal but the end of the season is after the last game", said Puel, 55.