He said: 'A set-piece does us and it's a good set-piece but our keeper is disappointed with it.
"It's not so easy to control the game against this team, they score nearly every game", Herrera said. We also had to play against a very negative record of Manchester United in Spain so it's good. "We created chances in the first half and we deserved the goal".
"It's Old Trafford, it's their home they should be going and dominating us".
'This year we won 2-1 at the Bernabeu against Real Madrid and they are nearly in the Champions League final so we know we can do it. Regarding Rashford, Mourinho said: "He started the game already with a little problem and obviously with the running he was feeling [this]".
Unlike Sevilla this season, who benefited from last season's winners Real Madrid also qualifying for the group stage as runners-up in La Liga, United will be forced to negotiate a play-off as Europa League holders.
The teenage forward scored with an incredible free-kick reminiscent to the technique David Beckham famously honed during his days at Old Trafford to hand the Red Devils a slender one-goal advantage in the semi-finals.
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Three-time European champions United had never reached the last four of the Europa League or its predecessor the UEFA Cup, while Celta were in their first major continental semi-final. We have to keep our heads on the challenge and the big objective; we want to achieve the big goals, not the small ones.
"We had control and we knew what we had to do", he told MUTV. "I think he'll be really happy with me".
"We have confidence in the fact our attack is freed".
"In the second leg they need to play football because their fans will demand it".
And Herrera again played a key role in helping his side get over the line and the midfielder credited Mourinho for helping him feel more important at Old Trafford this season. "The free-kick is really well taken and I think the goalkeeper has no chance because the ball is really fast".