"That's a tough break," manager Lloyd McClendon said. "It was almost a little freakish. He went up and came down on the opposite foot and fractured his [lower leg]. It's a little tough. He just landed awkwardly."
Choi played in 70 games at Triple-A Tacoma last year in a season shortened by a 50-game suspension following a positive test for a performance-enhancing substance. He was likely ticketed for Tacoma again this year, but he was one of several first basemen in camp providing depth behind starter Logan Morrison.
Choi hit .283 with five homers and 30 RBIs in 237 at-bats for Tacoma in 2014 after a strong '13 season in which he batted .295 with 18 homers and 85 RBIs in 122 games split between Class A High Desert, Double-A Jackson and Tacoma.
Choi is one of three first basemen on Seattle's 40-man roster, along with Morrison and Jesus Montero. But McClendon has talked of using newly acquired veteran Rickie Weeks as a backup first base option, while Willie Bloomquist can also play that position.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.