Right-hander Taijuan Walker started Friday for Triple-A Tacoma, so it likely won't be him. Rehabbing left-hander James Paxton is at least one more rehab start away -- and, likely two, if the Mariners want him stretched to 90 pitches.
"I'm sure we'll probably have an answer by Sunday," McClendon said.
Earl Bloom is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.