Man Utd midfielder Marouane Fellaini: Celta Vigo will fight back

Mourinho claimed that the supporters don't truly know how much his team is struggling right now from fixture congestion and the injuries that have accrued from the heightened workload.

"Luke Shaw is injured and it is an important injury obviously", Mourinho said Wednesday.

"He works, he's mature and what matters is not his age but his quality".

"After that Mourinho has got a lot of experience and he just tells his players: "Game's over, game's finished, 1-0, we're not gonna play anymore football tonight".

"Because of their comfortable situation in La Liga they manage to think only about Europa League, rest players, to be in the maximum of their condition, so it is a hard match for us", added Mourinho.

The visitors had the best chances in the early exchanges, though the Galicians made the first clear-cut opening for the unmarked Daniel Wass who headed wide from close range.

Thereafter, it fell on Alvarez to keep Celta in the tie.

On the second leg, Berizzo added: "We are going to play a game having learned what happened tonight".

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The first was a spectacular one-handed dive to stop a curling shot from Rashford from going into the top corner in the 20th.

Mourinho clearly has that in mind against Arsenal on Sunday after United's stretched squad was further depleted when both Rashford and Ashley Young limped off.

"I will rotate players again to give some players a chance again". "First of all we have to visit Celta in the Europa League".

One definite change will see David de Gea come into the side to replace Sergio Romero in goal.

Rashford made the trip to Vigo by almost 1,000 United fans worthwhile.

The 19-year-old, guilty of squandering his fair share of chances, stepped up to expertedly curl the ball beyond Alvarez in the 67th minute for a crucial away win for United.

Celta have already overcome losing the first leg 1-0 at home on their run to the last four with a 2-0 win at Shakhtar Donetsk in the last 32.

But in-form Rashford, who also scored a dramatic extra-time victor against Anderlecht in the quarter-finals, fooled Celta goalkeeper Sergio Alvarez with his set-piece to ensure United take an away goal and an aggregate lead back to Old Trafford for next Thursday's second leg.