Mourinho is wary of Villa following their success at Arsenal.
"It's not such a big surprise because Aston Villa can do that to any one of us," Mourinho said. "Last season they had more points away from home than at Villa Park.
"They are a team with qualities to play away, to play the counter-attack game they played at the Emirates.
"They are a good team. It's not such a big drama, they can beat any one of the contenders."
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