United have also lost two of their last three home games against West Brom, although they did record a 2-0 victory when the two teams met at The Hawthorns earlier in the season.
However, it won't be easy for the Red Devils against Tony Pulis' West Brom, who find themselves eighth in the table having won 12 of their 29 games this term.
The match continued in the same pattern after the break with West Brom soaking up United's timid attacking play. "If the first thing you think is where you're going to live, think Los Angeles", he said.
"Many people, especially in some positions, can not play and I would prefer to give a little rest to fearless guys like Antonio and Eric, who were playing for the national teams and travelling here to come to play again".
"The other ones were a flash of talent, a glimpse of talent, one good action, nearly goal and we need to kill opponents".
"But what I knew about him was a season full of injuries, a season where he nearly didn't play, a season where he was not even having treatment in the club".
Mourinho's side is four points behind Liverpool in fourth, albeit with two games in hand.
"Then you have a completely different story because then they have to play a different way and we are not consistent on this".
"So we lose four and I think Paul Pogba is also out".
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"When we have the last touch - we have to score", Mourinho said.
Pulis, too, thinks that United will be much improved next season.
They face a two-legged quarter-final against Belgian side Anderlecht later this month.
Asked by a BBC television reporter if the teams had cancelled each other out, an incredulous Mourinho replied: "I am sorry to say, but it is a silly question".
There's definitely some boredom setting in in the stands, and it seems the players are getting a bit bored by the fare as well, as could be seen from Fellaini's post-match interview. He said: "They are not with injuries that stop them to play".
"Chelsea, before they are on holidays and after they are on holidays". Before and after they are on holidays.
"One team had the ball, one team didn't". In 15 days' time maybe the Premier League is not important for us, maybe it is.
Manchester United finally moved out of sixth place after their last match before the global break, a 3-1 win away to Middlesbrough.
"Then it is a hard job and they try to do the best they can and I'm sure that in the end of the summer, probably, we don't have exactly my first options because it's hard to succeed in every attempt". The important matches are only Anderlecht.