Mourinho branded his players "masters in complication" in the aftermath of their defeat to the Baggies.
Manchester City are now 16 points ahead of 2nd placed side Manchester United - the Premier League record points gap between 1st and 2nd place at the end of a season is now 18 points by Manchester United in 1999-00.
Ahead of the Baggies' visit, the Manchester United boss confirmed that he had a full squad at his disposal apart from second-choice goalkeeper Sergio Romero who has been out on the sidelines since the worldwide break. "Maybe also City will invest massively and they don't let the others close the gap to them, I don't know", said Mourinho.
You've won every Premier League game in March and April has got off to a good start, too. "But he's obviously improving; he's obviously getting more comfortable to play with the team, and I'm pretty sure that, next season, will be better". The Red Devils come into the game high on spirits, following their 3-2 derby triumph against neighbours Manchester City last weekend. "We all know how important it is", Mata said.
Mata knows how significant it could be if this year's team win the trophy in the coming weeks, even if Spurs represent hard opponents at Wembley.
Pogba was substituted after 57 minutes of United's defeat and Mourinho did not make any attempt to hide his unhappiness with the team's performance and the inconsistency of his most expensive player. They have lost eight of the last 10 games and drew their previous match against Swansea City under caretaker boss Darren Moore.
"It's incredible the way we played and I am so glad to be here and be part of this club", he said after the 3-1 win over Spurs at Wembley.
City clinched the first division league title in 1936-1937 and 1967-1968, while they have won the competition in its current form twice - in 2011-2012 and 2013-2014.
West Brom are bottom of the standings with 21 points and in danger of dropping to the Championship.
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