As a mark of respect, Uefa have confirmed that the celebrations in Stockholm that would have marked the competitions grand finale have been cut back.
United are eyeing a first European title since they won the Champions League in 2008, and will wear black armbands during the final in tribute to the terror attack victims.
Captain Wayne Rooney led a minute’s silence in memory of the victims in training before their flight to Sweden, while the club cancelled a pre-match press conference.
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Speaking of the attack, Mourinho said: “We’re all very sad about the tragic events last night; we can’t take out of our minds and hearts the victims and their families.”
Armed Swedish police will protect the squad at the Friends Arena, while anti-terror cops have built an impenetrable ring of steel around the stadium.