It's fair to say that Brendan Rodgers and Mario Balotelli go together a bit like chalk and cheese.
Why did Henry flop at Juventus?
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.
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.