The Sabres have four games remaining before the break, which starts on Feb. 7.
Moulson suffered the injury with 6:05 remaining in the Sabres 3-2 victory over the Phoenix Coyotes on Jan. 30 when he was slashed on the arm and then shoved by Coyotes captain Shane Doan and fell awkwardly into the boards.
Moulson was acquired by the Sabres on Oct. 27 along with two draft picks in a trade that sent co-captain Thomas Vanek to the New York Islanders.
In 40 games with the Sabres since the trade, Moulson has nine goals and 15 assists for 24 points, while also recording 16 penalty minutes and a minus-10 rating.
Including his totals from the first 11 games with the Islanders this season, Moulson currently leads the Sabres in goals (15) and points (33) in 51 games this season. His 18 assists rank him second on the team to defensemen Christian Ehrhoff’s 19.
Due to the loss of Moulson from the Sabres lineup, Coach Ted Nolan said Brian Flynn will see time in Moulson’s place on a line with Zemgus Girgensons and Tyler Ennis.