Seager visited a hand specialist Saturday and has been receiving treatment on his left wrist and hand. X-rays were negative. Manager Scott Servais says Seager won't do any physical activities Sunday.
The 2014 All-Star and Gold Glove Award winner was injured diving for a hard ground ball during a spring training game against the Chicago Cubs on Friday night.
The slimmed-down 31-year-old is hoping for a bounce-back season after hitting a career-worst .221 with 22 homers and a .673 OPS last season. He has a .318 batting average in nine spring training games.
It's unclear whether the injury will risk Seager's status for Seattle's season-opening series in Japan. The Mariners fly to Japan on Thursday before opening the season with two games against Oakland on March 20 and 21 at the Tokyo Dome.