• Walker, the club's top right-handed prospect, will likely be held back from throwing his first bullpen session until Monday after reporting some soreness in his right arm after overextending himself in some pre-camp throwing sessions, but the Mariners don't believe the issue is serious at all.
"Taijuan is fine," McClendon said. "He had a little soreness. He may be a little behind, but there's nothing pressing with that. He's moving forward and doing everything he needs to do."
• Catcher Jesus Sucre had to come out of a bullpen throwing session with right-hander Mark Rogers after taking an errant fastball off his right ankle Friday, but McClendon called it just the normal "nicks and bruises" that come in camp.
• Catcher Manny Pina arrived at camp Friday and will be on the field as soon as he passes his physical, leaving right-hander Ramon Ramirez as the only pitcher or catcher still having visa issues.
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.