The Pirates activated reliever George Kontos from the 10-day disabled list Thursday.
Kontos, a right-hander, went on the DL because of a strained right groin Aug. 22, retroactive to two days prior. He missed 15 games.
The Pirates claimed Kontos, 32, off waivers from the San Francisco Giants Aug. 5. In five innings he allowed one run, on a home run to Keon Broxton, and struck out seven.