"In the Premier League, we can only finish fifth or sixth, I think".
As many as 11 of Romero's 16 appearance this season have come in the Europa League and the Argentine global is set to be rewarded by staying in the team ahead of usual first choice David de Gea when United meet Ajax in Stockholm on May 24.
"There was no dilemma", he said of his decision to start Romero again on Thursday evening (11 May).
United have not shot up the league under Mourinho but the performances have boosted fans worn down by his predecessor Louis van Gaal's prosaic style and starved of the success they had grown used to under Sir Alex Ferguson. "I never saw in all my career two goalkeepers to be such friends", said Mourinho, whose sixth-place side visit Tottenham Hotspur in the Premier League on Sunday.
"We are speaking about the Argentina national goalkeeper and the Spain national goalkeeper".
"They are so friends and they support each other all the time".
"So I don't think it is about results I think it is more about the condition to arrive in Stockholm in the best possible conditions to compete against a team that today plays their last match and has 10 days without football just to prepare the match".
There had been suggestions Mourinho would restore David de Gea for the showpiece in Stockholm in what is a huge game for United, with a third trophy of the season and a place in the Champions League group stages at stake.
"But if everything goes normal and we have no problems, Sergio plays the final".
It'll be a tough afternoon for the Red Devils who are missing the likes of Marcos Rojo, Zlatan Ibrahimovic and Luke Shaw through injury, alongside Marouane Fellaini through suspension. But if I was in your chair, maybe.
United play Dutch side Ajax in the Europa League final on Wednesday, 24 May.
A direct red card carries a one-match ban - which means he will miss the final - but Uefa will determine whether to extend that at a hearing on 20 July.