The Celtic man is friends with a Bayern Munich star.
The young French attackers both spent the bulk of their developing years at Paris Saint-Germain, before going on establish themselves in different countries.
Coman, 20, joined Juventus in 2014 and has since emerged as one of Europe's hottest wingers after moving to Bayern Munich on a two-year loan last summer.
Meanwhile, Dembele - also 20 - left PSG for Fulham in 2013 and established himself as one of the Championship's finest young talents, reportedly courting interest from the likes of Arsenal and Tottenham Hotspur in recent months, but former Liverpool boss Brendan Rodgers convinced him to join his Celtic project this summer.
The young striker, who opened his account for Celtic with a penalty that sealed their place in the Champions League playoffs earlier this month, reveals that he watched his mate face Arsenal at the Emirates when Bayern Munich came to London last term.
"My friend Kingsley Coman was playing for Bayern Munich against Arsenal so I went to watch him one time. Kingsley is a big friend," he told The Scottish Sun.
"We had been playing together for seven years because he came to Paris St Germain one year after me. We were there together and also played together in the national team. He has already made it and I am happy for him."
Coman is a full France international after helping his nation reach the final of Euro 2016, losing to Portugal in the end.
But Dembele will hope that his performances are recognised by boss Didier Deschamps, which would be good news for Celtic because he would be doing something right.