Inter Milan boss Walter Mazzarri is impressed by Manchester United in preseason.

United beat AS Roma 3-2 earlier this week.

Mazzarri said: "At this moment Manchester United seem unbeatable. They won their first game 7-0 against LA Galaxy and then got an easy enough victory over Roma, despite the late comeback.

"It will be a great test. We will go there to fight it out, then see what the result is at the end.

"I know Van Gaal and his methods. We will prepare on a tactical level first and foremost, then I'll choose the line-up.

"Will I rotate the squad? I'll talk to those who played against Real Madrid, but it shouldn't be a problem."

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