Swansea have had a bid rejected for the midfielder but he appears to be on the move.
"I think he is preparing to go to another club," said Slutsky. "I don't know absolutely, but I think yes. I don't know (which club) but it's Premier League.
"I think there will be official information. It's his decision.
"I only listen to information - I don't take part in negotiations. I think a deal will be in some days."