Clarke was assistant manager to the 50-year-old at Chelsea.
But he insisted: "I don't know if he's coming or not, that's the truth.
"I know he was happy here because he had a good job at a good club and we were successful. That's what he likes, he likes to win football matches wherever he is.
"If he comes back, it's great for the Premier League. If he does come back and we get the chance to play against him that would be great."