Benitez admits that he is surprised at the Welsh side's Premier League struggles given their showing in the Europa League.
He said: "They were a very difficult rival for us. They play good football and they are a very good team.
"We have to give them credit because we had to work very hard to progress.
"I'm surprised by Swansea's position in the Premier League standings but they are coming back with a new manager to the level they were before.
"I give credit to Monk, I think he has a great future ahead of him."
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