TORONTO -- Right-hander Chris Tillman will have an MRI on his elbow on Tuesday after leaving his start Sunday against the Yankees with elbow stiffness.
Tillman experienced stiffness from the beginning of the outing and it continued to get worse as the game went on.
Manager Buck Showalter didn't want to take any chances with the 24-year-old.
"He wanted to continue, said he wasn't having any acute pain, but, [I] just didn't like the way he was describing it," Showalter said.
Tillman has thrown 153 2/3 innings between the Minors and Majors this season, which is well under his career high of 175 innings in 2010.
In 11 starts with Baltimore this season, Tillman is 7-2 with a 3.39 ERA.
Hunter called up, will work out of bullpen
TORONTO -- The Orioles recalled right-hander Tommy Hunter from Double-A Bowie for Monday's contest against the Blue Jays.
Hunter, who will pitch out of the bullpen, made one relief appearance at Bowie in his latest Minor League stint.
Over his five-year career, Hunter has made 13 relief outings, going 1-1 with a 5.06 ERA in 21 1/3 innings of work.
Manager Buck Showalter is hoping Hunter, who started 20 games for the Orioles this season, can make a smooth transition to the bullpen, just as lefty Brian Matusz did.
"Tommy, he's going to give us some potential length in the bullpen," Showalter said about the 26-year-old. "Some people think this might be where he ends up. We'll see, because he has pitched well out of the bullpen in the past.
"He is a guy that has experience up here at a young age. His stuff plays up a little bit out of the bullpen. We'll see if that continues at this level."
Showalter believes his velocity could be up a notch as a reliever, as Hunter reached 96 mph on the radar gun in his last outing at Bowie.
In his 20 starts, Hunter went 4-8 with a 5.71 ERA. He's pitched 4 1/3 innings in relief, allowing six earned runs on 10 hits and two walks, with four strikeouts.
Phillips recalled, Berken designated for assignment
TORONTO -- The Orioles selected the contract of left-hander Zach Phillips from Triple-A Norfolk. To make room on the 40-man roster, pitcher Jason Berken was designated for assignment.
Manager Buck Showalter wanted to add another lefty to his bullpen, relievers Brian Matusz and Randy Wolf were expected to be unavailable for Monday's series opener against the Blue Jays.
"Our plan was to bring in Zach anyway, but especially because Brian should be down today," Showalter said.
Phillips appeared in 42 games at Norfolk, going 2-2 with a 3.17 ERA over 54 innings. The 25-year-old has logged 8 2/3 innings at the big league level over parts of the past two seasons.
Showalter wants to stay away from Matusz, who has appeared in three consecutive games entering Monday. Since rejoining Baltimore as a reliever, Matusz has allowed one run over 4 1/3 innings while striking out six and walking one.
"He has done a good job. It's not one of those, 'I told you so, that's what we thought all along,'" Showalter said about Matusz's transition to the bullpen. "You look at his numbers, Minor Leagues and Major Leagues, and you know that he is capable of it.
"I know he's enjoying himself. He likes the idea of coming to the ballpark everyday and being engaged about having the chance to pitch and help the club."
Berken, meanwhile, appeared in one game with the Orioles this season, allowing seven runs -- two earned -- in one inning of work. The right-hander spent parts of the past four seasons with the Orioles.
Chris Toman is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.