Markov has spent the last three years in the KHL and has played for Yaroslavl Lokomotiv this season.
The 41-year-old played 16 seasons in the NHL, all with the Canadiens after the club selected him in the sixth round in 1998. He was a double star in the NHL.
In 990 career games with the Habs, Markov has scored 119 goals and 453 assists.
More details to come.