Lackey not fazed by swollen ankle

HOUSTON -- Red Sox starter John Lackey was hobbling around the clubhouse in black sandals and swelling on the outside of his left ankle that bordered somewhere between a golf ball and a tennis ball in size.

Lackey awkwardly rolled the ankle while fielding a ball in the second inning of Monday night’s 2-0 loss to the Astros. He limped off the field and went into the clubhouse, where members of the training staff taped the ankle to minimize swelling, and Lackey remained in the game.

Although the soreness persisted on Tuesday, both Lackey and Farrell seemed confident that he will be able to make his next start on Sunday in Kansas City.

“I think he did a great job considering the way he turned it,” Farrell said. “He didn’t try to overthrow it and come out of his delivery, and he pitched pretty damn well. What he showed us is clearly a hell of a competitor who wants to be on the mound.”

Reliever Matt Thornton remains day-to-day with soreness in his right oblique muscle. Thornton left Sunday night’s game after throwing just six pitches in the eighth inning. Farrell could be pressed to make a tough roster decision on Thursday when Daniel Nava returns to the team in Kansas City after a three-day paternity leave.

“I don’t want to go to the disabled list -- it’s something I despise,” Thornton said. “But at the same time, the team comes first, and they have to make a decision.”

Farrell said reliever Brandon Workman -- who was called up from Triple-A Pawtucket to fill Nava’s roster spot -- is not required by rule to be the one who gets optioned back down.

Farrell said that reliever Franklin Morales was scratched from his scheduled rehab outing Tuesday night in Pawtucket because of a “personal situation,” adding, “Our thoughts are with him on that.”