Thaiss signed a minor-league contract with the Astros on July 24.
The Mariners stated Monday that Donovan's concussion symptoms are starting to improve, Daniel Kramer of MLB.com reports.
The Astros signed Velazquez to a major-league contract Monday, Matt Kawahara of the Houston Chronicle reports.
Delgado was optioned to Triple-A Sugar Land on Monday, Chandler Rome of The Athletic reports.
Emerson will undergo season-ending left wrist surgery Wednesday, Adam Jude of The Seattle Times reports.
Woo (shoulder) told reporters Monday that he's "100 percent confident" he will make his scheduled start against the Phillies on Wednesday, Adam Jude of The Seattle Times reports.
Crawford (wrist) has rejoined the Mariners in Seattle and could be activated from the 10-day injured list as soon as Tuesday, Adam Jude of The Seattle Times reports.
The Mariners outrighted Diaz to Triple-A Tacoma on Monday.
Miller conceded after Sunday's loss to the Cubs that he's dealt with a minor right lat injury since his July 24 start against the Rangers, Adam Jude of The Seattle Times reports.
The Astros outrighted Velazquez to Triple-A Sugar Land on Sunday.
