The Blue Jays optioned Estrada to Triple-A Buffalo on Sunday.
Estrada was sent back to the minors to clear room on the 26-man roster for Ryan Burr (shoulder), who was reinstated from the 60-day injured list. After getting his first big-league call-up Friday, Estrada impressed in Saturday's 11-inning win over the Angels, giving up one earned run on two hits and no walks while striking out four over four frames of long relief.