Inter Milan boss Roberto Mancini is nervous facing Manchester City striker John Guidetti this week.
Guidetti is on-loan at Celtic, which face Inter in the Europa League.
"I love John Guidetti because he is a good guy," said ex-City boss Mancini. "He was a young player when we were both at Manchester City but he was a fantastic talent.
"He had a lot of injuries when he was with me but I hope he has now recovered from what happened. John can go to the very top if his physical condition stays OK.
"He is a fantastic player and a quality striker. He is strong and scores a lot of goals.
"I hope John does not come back to haunt me but I hope that he plays in these two games. I want him to score goals and have a lot of success in his career - but not against Inter Milan."
