A brace from Bruno Fernandes set United on their way before Marcus Rashford and Daniel James put the tie virtually out of the reach of Real Sociedad, who simply didn’t have the quality to really hurt United.
Manchester United are unbeaten in their last nine away games across all competition.
A comprehensive 4-0 victory seals a fourth win in the north Italian city, a first win in four, and puts Ole Gunnar Solskjaer’s side in complete control of the game.
Solskjaer made no secret of United’s attacking intentions when he spoke before kick-off.
“I want freshness and energy, players who play with the spirit of Man United, Solskjaer said, “We’re away in Europe so the message has been it’s worth going for goals. We have to take the advantage of whenever there is a chance we need to go forward – attack quickly.
We know that away goals are more important, so why not have a goal?” he said.