Just days after his dismissal at Tottenham, AS Roma hired Mourinho to take charge at the start of next season.
Bailly has revealed how he was one of the first players Mourinho contacted after news broke of his sacking in north London.
He told The Times: “When he [Mourinho] was sacked from Tottenham I sent him a message and when he signed for Roma I spoke to him on the phone.
"We had a few laughs. He's a coach I've always been good with. Hopefully, he'll do well in Italy and we'll meet in the future."