The Athletics acquired Bielak from the Astros on Thursday in exchange for cash considerations, Matt Kawahara of the Houston Chronicle reports.

The Astros designated Bielak for assignment Saturday, Chandler Rome of The Athletic reports.

Houston optioned Bielak to Triple-A Sugar Land on Friday.

Houston recalled Bielak from Triple-A Sugar Land on Thursday, Matt Kawahara of the Houston Chronicle reports.

Bielak was optioned to Triple-A Sugar Land on Monday, Chandler Rome of The Athletic reports.

Bielak (5-6) took the loss Sunday, allowing six runs (three earned) on eight hits and three walks over five innings against the Rays. He struck out four.

Bielak (5-5) earned the win Wednesday, allowing one hit and three walks over 5.2 scoreless innings against the Rockies. He struck out four.

Bielak (4-5) took the loss Sunday against the Mariners, allowing three runs (two earned) on four hits and a walk while striking out five over five innings.

Bielak will start for the Astros on Tuesday against the Rockies, Matt Kawahara of the Houston Chronicle reports.

Bielak will be available in relief Monday versus the Rangers but is an option to start Tuesday against the Rockies, Brian McTaggart of MLB.com reports.