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Ole Gunnar Solskjaer said Bruno Fernandes' presence at Manchester United has given the team a lift since his arrival in January.
United spent an initial €55 million (£47 million) to recruit him from Sporting Lisbon.
Solskjaer said: "I'm not surprised [at his impact] because I saw what he can do on the pitch and his leadership qualities."
"He relishes it, loves being around the place, gives everyone a boost and has an aura," the manager added.
Red Devils legend Ryan Giggs shares a similar view of the playmaker.