"Stro is good to go tomorrow, but you never know if that [blister] flares up," Blue Jays manager John Gibbons said while discussing his bullpen prior to Friday's game.
The 26-year-old Stroman is 8-5 with a 3.42 ERA in 17 starts this season.
Houston will counter with Mike Fiers, who has bounced back nicely after allowing 18 home runs in 46 2/3 innings over his first nine starts. The right-hander has gone 4-1 with a 2.20 ERA over his last seven starts, and he hasn't allowed a home run in a span of 41 innings.
Fiers threw four scoreless innings in a win over the Yankees on Sunday, but allowed four walks while striking out seven. The 32-year-old is 5-3 with a 3.80 ERA in 16 starts this season.
Three things to know about this game
• Blue Jays closer Roberto Osuna was named as a replacement for the American League All-Star team on Friday. The 22-year-old right-hander has converted 21 consecutive save opportunities after blowing three of four to open the season.
• Astros shortstop Carlos Correa extended his hit streak to a career-best 15 games with a two-run home run off Aaron Sanchez in the first inning on Friday night. Correa has also reached base safely in a career-high 23 straight games, dating back to June 10.
• Blue Jays righty Joe Biagini returned to the bullpen on Friday after making 10 starts. With Sanchez activated from the disabled list, Dominic Leone was optioned to Triple-A Buffalo in a corresponding move.
Dhiren Mahiban is a contributor to MLB.com.
This story was not subject to the approval of Major League Baseball or its clubs.