However, United could add the Europa League to the Community Shield and League Cup triumphs this season by beating Ajax in the final in Stockholm on May 24.
The versatile defender played the full 90 minutes as United lost 2-1 to Tottenham in the last game at White Hart Lane in it's current form, where Mourinho made eight changes.
"I don't know the way the other clubs think; I don't know what is important for them", Mourinho said.
Bastian Schweinsteiger has a reward awaiting him should Manchester United win the Europa League tournament this season. I don't know when we play the game.
Victory for Manchester United in the Europa League final against Ajax next week would be collectively worth £38 million to their players and make it the most lucrative match ever staged for a single squad.
"You can not play two big competitions with 15 players".
United executive vice-chairman, Ed Woodward, said: "We are forecasting better full-year financial performance than expected and as such have raised our revenue and profit guidance for the year". "At the moment, the Premier League matches are the ones we don't want to play".
Mourinho shrugged off any disappointment surrounding a probable sixth-place finish for his EFL Cup winners - United have not finished lower since David Moyes' shambolic tenure in the 2013-14 season. "When people say that we gambled by going for the Europa League, we didn't gamble because nobody can play two big competitions with 15 players and this is what we had at the time", he said.
"We have the Ajax way of playing football".
Spurs ensured second spot with the win, thanks to goals from Wanyama and Kane, while Rooney scored for United.
Mourinho already has to do without Zlatan Ibrahimovic, Marcos Rojo, Luke Shaw, Ashley Young and Tim Fosu-Mensah for his side's remaining league matches through injury. "I wish them all the best", Bastian Schweinsteiger said as he was surrounded by local, national and global media. "So I have to play them but I have to play them mixed, in periods".
"I don't want to field a team where people have a feeling that we are not fighting for the result".
"At the end of the day, if we go to Old Trafford and score the first goal, we are in the driving seat because if we score another one, they have to score two".