No word yet whether or not he will play in later rounds of the NCAA tournament.
The Orange have non-conference wins against tournament-bound Northeastern and Ohio State, but also have losses to Buffalo and Old Dominion.
The Orange play Baylor in Salt Lake City on Thursday.
The Syracuse Orange's first-round assignment of facing No. 9-seed Baylor Bears was already going to be hard, but now No. 8-seed Syracuse will have to manage Thursday without one of its starting guards.
Details regarding the nature of Howard's suspension were not shared in the release.
Syracuse are set to open their 2019 NCAA tournament against Baylor on Thursday, but will have to do so without one of their star players. The senior guard poured in 28 points in the team's ACC tournament game against the Duke Blue Devils.
Howard missed the first four games of Syracuse's season because of a lower leg injury.
Howard started 28 games for the Orange this season, averaging 8.9 points per game and averaging almost 27 minutes on the floor per night. Based on what Tyus Battle and Oshae Brissett said on Wednesday during media availability, the SU players had learned of the news recently.
Even with all of Syracuse's struggles with offensive efficiency, they have more scorers than the hobbled Bears. Mason could change the outcome for the Bears if he can rekindle the magic he had with Yale in 2016, but that seems unlikely with how he's played lately.