"I see a specialist on Tuesday morning. They didn't say anything about how long I might be out, but it is broken bad, so there might be surgery,'' Cano said after the Mariners' 5-4 loss to the Tigers. "All I can do is do whatever it takes to get 100 percent and get back as soon as I can.''
Cano was struck by an 88 mph fastball from left-hander Blaine Hardy in the third inning. After a brief examination by the Seattle trainer, Cano left the game and was replaced by infielder Andrew Romine.
The Mariners announced that Cano has a fractured fifth metacarpal.
Seattle is 22-17, and Cano is one of the team's biggest stars. He hit 39 home runs in 2016, though that number dipped to 23 last season.
Cano, 35, is batting .287 with four home runs and 23 RBIs this season, his fifth with the Mariners. He hasn't missed a game this season and hasn't played in fewer than 150 games in any of the past 11 seasons.
Information from The Associated Press was used in this report.