Melvin, when asked if Manaea's DL stint could subsequently be extended, replied, "Could be." The A's are at least certain he won't return when eligible Sunday; right-hander Sonny Gray will make the start against the Tigers at the Coliseum.
Manaea last pitched April 26 in Anaheim, throwing just two innings and 34 pitches before he was pulled because of shoulder discomfort.
• Rehabbing reliever John Axford (right shoulder) threw a 23-pitch bullpen session in Minneapolis on Thursday morning, reporting no issues. Melvin expects the veteran to throw one more bullpen before facing hitters.
Jane Lee has covered the A's for MLB.com since 2010. This story was not subject to the approval of Major League Baseball or its clubs.