Columbia guard Grant Mullins will spend his final season of eligibility at Cal, according to multiple reports.

This past season with the Lions, the 6-foot-3, 175-pound Ontario native averaged 13.3 points, 3.8 rebounds and 3.3 assists per game. He shot 46.8 percent from the floor, including 43.9 percent from beyond the arc, and 83.1 percent from the foul line.

Mullins, who has family in the Bay Area, left Columbia because the Ivy League declares graduate students ineligible to play. Since he is set to graduate, he will be eligible to play the 2016-17 season with the Bears. Mullins’ former Lions head coach, Kyle Smith, joined San Francisco last month in the same capacity.

Though hardly a program-defining addition, he should be a key rotation player for Cal. He will help offset the departure of all-Pac-12 point guard Tyrone Wallace, who led the Bears last season with 15.3 points and 4.4 assists per game. Mullins, who can play either guard spot, joins a backcourt set to feature seniors Sam Singer, Jordan Mathews and Jabari Bird.

Mathews and Bird, two of Cal’s three top returning scorers, are expected to start next season. Mullins could challenge Singer, who started nine games in 2015-16 for an injured Wallace, for the first-team point guard job.

Mullins visited Cal last Monday. He reportedly chose the Bears over Michigan and Syracuse, both of which he also toured in recent days. His commitment comes two years after another Ivy League grad transfer, Cornell forward Dwight Tarwater, joined the Bears. Tarwater served this past season as a graduate assistant on Cuonzo Martin’s staff.

Cal has been active on the transfer market. Two weeks ago, it landed a commitment from UNLV guard Jordan Cornish. N.C. State guards Cody and Caleb Martin will reportedly visit the Bears this weekend. From May 5-7, Cal will host Drake center Dominik Olejniczak.

The Bears have been linked to nine other transfer targets, which raises the question of how Martin would accommodate more additions. Would a player or two be taken off scholarship? Would someone leave the program?

Mullins, after all, will take Cal’s last available scholarship for 2016-17. Sunday night, forward Ivan Rabb — a projected lottery pick — bucked the national trend by deciding to return for his sophomore season.

Briefly: Cal will start a home-and-home series with Gonzaga next season in Spokane, Wash., according to CBS Sports. The Bulldogs will play the Bears in Berkeley in 2017-18.

Connor Letourneau is a San Francisco Chronicle staff writer. Email: cletourneau@sfchronicle.com. Twitter: @Con_Chron