The exact position has not been announced, but it wouldn't be a surprise if Trembley ended up as Porter's bench coach. Trembley managed Porter in the minors.
Tha Astros also hired John Malee as hitting coach and retained Doug Brocail (pitching coach) and Dave Clark (position unspecified).
"A manager is only as good as his coaching staff and I'm confident these four will contribute to a terrific staff that can help us accomplish our goals," Porter said in a team news release. "I played for Dave Trembley and I worked with John Mallee in the past. Doug Brocail and Dave Clark are excellent coaches, who will provide the continuity to the past. These members of our staff give us our best chance to win ballgames and develop winning players."
Trembley, 60, managed the Orioles from 2007 to 2010. His teams were 187-283 during that span. It was his first big league managerial job after two decades in the minors.