It's fair to say that Brendan Rodgers and Mario Balotelli go together a bit like chalk and cheese.
The Italian scored only once in the Premier League while at Liverpool under the now Celtic boss, amid widespread reports that they had a breakdown in their relationship.
Both have moved on, but the wounds don't appear to have healed.
On Tuesday, the Celtic boss had a joke at the Nice forward's expense during his side's Player of the Year awards evening.
Brendan Rodgers you are also the best manager I ever had. Amazing.— Mario Balotelli (@FinallyMario) May 3, 2017
Asked who was the best player he has coached, Rodgers responded: “Mario Balotelli… he was a fantastic player.”
The Italian clearly caught wind of this remark and took to Twitter to respond in kind.
"Brendan Rodgers you are also the best manager I ever had. Amazing," Balotelli said in a tweet dripping with sarcasm.
Rodgers remains on course to secure a domestic treble with Celtic in his first season in Scotland, while Balotelli has helped Nice into the Champions League next season. A reunion could be tasty.