Weber was placed on the 10-day disabled list Sunday due to a right biceps strain, Bob Dutton of The Tacoma News Tribune reports.
Weber was diagnosed with the injury after meeting with a doctor following his spot start Saturday against the Blue Jays, during which he gave up one run over 3.2 innings. The right-hander was only making a start for the Mariners with several key rotation members dealing with injuries, and his move to the DL will likely instead prompt the team to bring aboard another starter from the minors when a fifth starter is needed again. In the meantime, the Mariners promoted Dan Altavilla from Triple-A Tacoma in a corresponding move to provide an extra arm out of the bullpen.