The pair played together at CSKA up until last year.
And this morning posted a public Instagram message wishing the attacking midfielder luck at Chelsea.
Chepchugov wrote: "When you @ alex_golovin17 came to the main team, # CSKA! I immediately told you, you will also train.
"Two years later you will get to the European team. Today, a lot of advice, and attention! I wish you to feel happy at #Chelsea. Have fun, great career !!!"