Mariners pitcher Taijuan Walker is scheduled for his first bullpen session Monday, according to the Tacoma News Tribune.
Walker's session is tentative, so whether he actually throws will likely be determined by how he's feeling Monday. Walker came into camp with some shoulder soreness, though both he and the team have downplayed the injury.
Walker posted a 3.60 ERA in three starts last year. He's expected to compete for a rotation spot this spring.