On Wednesday, Halladay will pitch off a mound in his first bullpen session since being removed in the fourth inning of his previous outing due to the injury. After that test, Toronto will determine whether Halladay will be able to take the mound on Saturday for a start against the Nationals.
"He feels a bit better," Blue Jays manager Cito Gaston said on Tuesday. "He's going to throw a little bit tomorrow and see how it goes. Then we should know more tomorrow after he does that."
Halladay originally was scheduled to start against Philadelphia on Wednesday, but right-hander Scott Richmond is taking his turn in the rotation. The next time Toronto needs a starter is on Saturday, and the club will need to find a replacement for Halladay if he is unable to go. In that scenario, the Jays could place Halladay on the 15-day disabled list, retroactive to Saturday.
Halladay, who leads the Major Leagues in wins (10) and innings (103) and has a 2.53 ERA, felt a sharp pain during his second pitch in the top of the fourth inning of Toronto's 7-3 loss to Florida on Friday. He attempted a warmup pitch in front of Gaston and head trainer George Poulis, but the pitcher exited after still experiencing discomfort.
Prior to that injury-shortened appearance, Halladay had turned in at least seven innings in his 13 starts and was coming off back-to-back complete-game performances. Over his last 10 trips up the hill, including Friday's no-decision, Halladay has gone 7-0 with a 2.07 ERA, 62 strikeouts and nine walks over 74 innings.
Jordan Bastian is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.