KANSAS CITY -- The Tigers have decided to temporarily slow right-hander Doug Fister's rehabilitation program after Fister felt something in the abdomen area while throwing on Tuesday.
Fister, recovering from a left costochondral strain in his rib cage, cut short the Tuesday session after experiencing discomfort.
"We're backing off him for a couple of days," Tigers trainer Kevin Rand said. "He stopped because he was having some pain in the abdomen."
Fister, who was 8-1 for the Tigers with a 1.79 earned run average in 10 starts last year, went on the 15-day disabled list April 8. He had thrown 10 fastballs off the mound on Monday before throwing again on Tuesday.
"At this point, we're just being overly cautious," Rand said. "When he went up on the mound [Tuesday], he wasn't ready to really let it go in full."
In another injury-related development, Andy Dirks is receiving treatment after tweaking his left hamstring while scoring the go-ahead run from second in the eighth inning Tuesday night.
Dirks, who had a single to start the winning two-run rally, felt tightness as he scored on a Miguel Cabrera single.
"It's a little sore," Rand said. "Basically, he's a day-to-day guy. It'll probably be a couple to three days at this point. It tightened up on his way around third. He didn't force it or do anything to really pull it."