Security has been increased in Brussels ahead of tomorrow's clash with Anderlecht after three explosions near Dortmund's coach.
Defender Marc Bartra broke a bone in his right wrist as a result of the incident and the match against Monaco was postponed and rearranged for this evening.
But Mourinho admits he is trying not to think too much about last night and has put his faith in those protecting his team.
He said: "I try not to think too much about it.
"I try to focus on our job and to focus on why we’re there to play.
Manchester United board plane ahead of Europa League clash with Anderlecht Wed, April 12, 2017
Manchester United are spotted boarding a plane ahead of their Europa League quarter-final tie against Anderlecht
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Manchester United players board a plane ahead of their clash with Anderlecht
Manchester United manager Jose Mourinho during his press conference
"This is a quarter final, we have to be focused on it and that’s what we try to do.
"Obviously, solidarity with what happened yesterday with the players that cannot play today, with the people that were scared.
"As I was saying we have to trust the people who are working with our security.
"We have to believe that the match tomorrow will be what people want it to be – a very good game.
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"I try to focus on the football."