Cal men’s basketball starting point guard Tyrone Wallace is officially out for four to six weeks with a broken bone in his wrist.

At a press conference Tuesday it was announced that the senior will miss significant playing time due to an injury he suffered when his hand was hit during a five-on-five drill at Saturday’s practice.

“You lose a key guy like (Wallace), not an easy thing to transition,” said Cal head coach Cuonzo Martin. “He is a tremendous leader, a presence from a guy who is battle tested.”

The news of the loss of Wallace comes on the heels of a three-game losing streak for the Bears, who are now 12-6 on the season and 2-3 in the Pac-12. Trying to find a way out of the bottom half of the conference will be no easy feat for a Cal team that is now preparing to face Arizona State and No. 12 Arizona this week at home without its leading scorer, averaging 15.4 points a game. Wallace had not missed a game in his four-year Cal career up to this point, starting in 108 games.

Junior Sam Singer will take his place in the starting lineup, with assistance from sophomore Brandon Chauca. Singer is only averaging 4.1 points per game, but has shown flashes of success this season, including seeing his season highs in playing time in the last two games.

“We’re all confident in Sam as a point guard and as a player. He’s been really consistent for us lately,” said junior guard Jabari Bird. “We have to come together as a team. It’s not just one person to put the team on their back. We’re a team for a reason. . . . We’ve got to come together as group.”

Alaina Getzenberg covers men’s basketball. Contact her at [email protected].Follow her on Twitter @agetzenberg.