Hassell (undisclosed) has gone 5-for-14 with two doubles, one walk, two stolen bases, three RBI and three runs in four games for Triple-A Indianapolis since being reinstated from the 7-day injured list Wednesday.
The 25-year-old outfielder has spent time at three levels since joining the Pirates organization in a July 16 trade, slashing .256/.373/.326 with three stolen bases over 12 contests.