TORONTO -- Toronto Blue Jays right-hander Aaron Sanchez was placed on the 10-day disabled list Sunday with a blister on the middle finger of his pitching hand, another blow to a struggling team off to a 2-9 start.
Manager John Gibbons and trainer George Poulis came to the mound when Happ appeared to be in pain after throwing a first-pitch fastball to Orioles outfielder Adam Jones. Following a brief conversation, Happ walked off the mound and into the clubhouse. He allowed one run and four hits in 4⅓ innings and took the loss as the Orioles coasted to an 11-4 victory.
"Last pitch of the fourth inning I felt kind of a pull, a tug in my elbow,'' Happ said. "Then I went back out there for the fifth and it got progressively worse.''
Happ will undergo an MRI on Monday, an off day.
Sanchez, the AL ERA leader last season, allowed five runs and seven hits, including three home runs, in a loss to Baltimore on Friday. He is 0-1 with a 4.38 ERA. The blister has been bothering him since spring training and also was an issue in September.
Toronto recalled left-hander Matt Dermody from Triple-A Buffalo on Sunday.
The Blue Jays lost 2015 AL MVP Josh Donaldson to a calf injury Thursday and put him on the 10-day DL on Friday.
Toronto had lost seven straight, falling to a franchise-worst 1-8 to start a season, before Kendrys Morales hit the game-winning home run in the ninth inning against Baltimore on Saturday.
The Associated Press contributed to this report.