"He's come along fine," Hurdle said. "[He's] mixing his pitches. He's got a couple more one-inning outings scheduled, and then he's going to get plugged in the bullpen to be used however deemed necessary -- multiple innings, maybe a long guy, the variety of ways that we would use him if and when he would get back here."
Leroux has been on the 60-day disabled list all season after sustaining the injury in the Pirates' final exhibition game.
Leroux made his third Minor League appearance on Tuesday, throwing a shutout inning. He also threw one scoreless frame on Sunday after giving up one run on two hits in a three-inning start with Class A Bradenton on June 6.
Hurdle said that Leroux's effectiveness has been improving, as he needed only 12 pitches on Tuesday outing compared with 21 on Sunday.
Leroux has played in parts of three Major League seasons, most recently posting a 1-1 record and 2.88 ERA in 25 innings for Pittsburgh in 2011.