Taillon was scheduled to pitch on Tuesday, Pirates general manager Neal Huntington said. The Pirates will continue to evaluate Taillon and hold him out of game action until further notice.
"We're working through exactly how long and what the severity is, working through the evaluation process," Huntington said.
The second overall pick in the 2010 Draft, Taillon advanced to Triple-A Indianapolis at the end of the 2013 season. He underwent Tommy John surgery last April and missed the entire season.
The 23-year-old right-hander has been pitching in extended spring training games. He was expected to advance soon to one of the Pirates' Minor League affiliates, most likely the Gulf Coast League club, to continue his rehabilitation.
Taillon threw 74 pitches over five innings Thursday in extended spring camp. The Pirates announced Taillon came through the start "without issue," but Huntington said the "soreness and discomfort" in his lower abs flared up Friday.
Around the horn
• Veteran right-hander Chris Volstad was at PNC Park on Tuesday as a precaution but not added to the Bucs' active roster.
Starter Charlie Morton recorded only two outs in Sunday's 9-2 loss to the Nationals, but Vance Worley (4 1/3 innings) and Antonio Bastardo (two innings) picked up the bulk of the workload out of the bullpen.
"Just can't say enough good things about the job Vance did and then Bastardo giving us two quiet innings," Huntington said. "In case we felt like we needed the arm today, we brought Chris here."
Volstad was scratched from his start for Indianapolis on Monday. The right-hander is 5-2 with a 3.43 ERA for the Indians this season.
• First baseman/outfielder Andrew Lambo, out since May 3 due to plantar fasciitis in his left foot, has been able to participate in some baseball activities, Huntington said.
"Better days. Able to take some swings, able to throw, able to do some baseball activity," Huntington said. "But to be a baseball player, still not quite there yet."