TORONTO -- New Blue Jays pitcher Jameson Taillon exited his first home start in Toronto after four scoreless innings against Boston on Monday night because of right forearm discomfort.
Manager John Schneider told reporters after the Blue Jays' 2-1 win that Taillon reported tightness and he was set to undergo an MRI.
"He said his forearm was a little tight, kind of getting some extension on cutters, sliders," Schneider said. "For a guy with some injury history, hopefully we can be proactive, and I don't want to take any chances with him."
The Blue Jays got Taillon from the Chicago Cubs in a trade Aug. 2, three days before his Toronto debut, in which he allowed three runs in four innings at Houston.
Taillon gave up one hit, struck out three and walked three while throwing 34 of his 61 pitches for strikes against the Red Sox. The game was scoreless when he was seen talking to Schneider and team trainers in the dugout after finishing the fourth inning.
"Hoping for the best," the manager said. "He was throwing the ball well, and left some runners out there, and got back in counts and made some good pitches."
Simeon Woods Richardson (2-7) took over on the mound for Toronto in the fifth. He pitched three innings for the win, and the only run he allowed came on a bizarre inning-ending double play that was a sacrifice fly when the runner never tagged up from third base.
The Blue Jays are already without starters Trey Yesavage (left knee inflammation), Spencer Arrighetti (nerve irritation in right foot) and Patrick Corbin (shoulder). Yesavage and Arrighetti are on the 15-day injured list, and Corbin is on the 60-day IL.
Arrighetti was on the injured list when he was acquired from Houston in a trade Aug. 3 for center fielder Daulton Varsho.
The Associated Press contributed to this report.