Celtic moved six points clear at the top of the Scottish Premiership on Saturday with a 2-1 win over St. Johnstone, but Ronny Deila's men must now turn their attentions to the Europa League.
The Bhoys have a huge clash at Celtic Park on Thursday, as they face Italian giants Inter Milan in the last 32 of the competition.
Inter are managed by a familiar face in former Manchester City boss Roberto Mancini, who returned to the San Siro back in November.
Ahead of his side's clash with Celtic, Mancini spoke to the press, and revealed why he's fearful of facing Hoops striker John Guidetti - having worked with the Swede at City - as reported by the Daily Mail.
"I love John Guidetti because he is a good guy," said 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!" he added.
Guidetti, 22, is on a season-long loan deal from City, and got off to a sensational start to life with Celtic, scoring 11 goals in 12 games, but has since gone ten games without a goal.
Deila will be hoping that Guidetti can come back to haunt Mancini, but on recent form, that doesn't see likely, with Leigh Griffiths likely to lead the line again having scored against Partick on Saturday.