The Canadiens made the announcement on Sunday, following their final game of the season in Toronto.
McCarron, Rychel and Lernout all suited up for the Rocket during the 2017-18 campaign.
McCarron picked up his first point of the season with the Canadiens during Saturday night's contest, collecting an assist on their first goal of the game at the Air Canada Centre. It was his 18th game of the season with the big club.
Rychel, meanwhile, took part in four games with the Canadiens and registered one goal and one assist.
Lernout enjoyed two stints with the Canadiens during the year, taking part in every game during his most recent call-up. He played 15 straight games, amassing one assist.
All three players accompanied the team back to Montreal on Saturday night and will take part in the Rocket's next practice session.
