Everton boss Ronald Koeman feels Manchester United can be surprised by Ajax next week in the Europa League final.

Writing for De Telegraaf, Koeman says United could, however, "outgun" their Dutch opponents.

"I hate to say it, but right away Ajax in Stockholm must try not to be outgunned.

"I have said before that Manchester United is not unbeatable. In England, the team of Mourinho maybe not often lost, but they also win not much.

"I have also sometimes called them naive, but the team of Ajax has grown. The proof of this now comes and I hope it pays off in Stockholm."