Righthander Jack Cassel, who made his major league debut last season with the Padres, signed a one-year contract with the Astros on Monday.
The deal for the 27-year-old Cassel is worth $400,000.
He made six appearances - four starts - for the Padres last season, posting a 1-1 record with a 3.97 ERA.
Astros Sign RHP Cassel To One-Year Deal