Harrison said he felt a twinge in his side when he jerked out of the way to avoid an offline throw by shortstop Jose Reyes in his fourth at-bat of the game. Though Harrison stole second immediately after reaching, he was replaced in the field by Brandon Wood the next half-inning.
"It's not too bad," Harrison said of the injury. "You just don't want a couple day thing to turn into a couple weeks. It's always a little frustrating when you have a little setback like this, but Lord willing, I'll be back in there as soon as possible."
The Pirates told Harrison not to swing a bat or throw on Sunday and the club will evaluate Harrison's status daily. If the ailment becomes something that is going to keep Harrison out for more than a few days, the Bucs might be prompted to again dig into their Minor League depth for another option.
Pittsburgh is already missing starting third baseman Pedro Alvarez (right quad strain) and Steve Pearce (right calf strain). Wood will be the team's starter at the position while Harrison is sidelined. Pedro Ciriaco will serve as the backup.
"Possibly by getting him out now," manager Clint Hurdle said, "it will shorten the time he'll be away."
Since joining the club on May 30, Harrison has hit safely in nine of his 10 starts. In nine at-bats with runners in scoring position, Harrison has four hits.