McCullers (back) is scheduled to throw another bullpen session Thursday, and manager A.J. Hinch said "there's a rehab assignment in sight," Jake Kaplan of the Houston Chronicle reports.
Thursday will mark his second bullpen in four days, and the Astros will likely wait and see how McCullers responds to Thursday's activity before deciding on his next step. He'll still need to progress to facing live hitters before he embarks on a rehab assignment, but he's inching closer to a return to the big-league rotation. A clearer timetable for his return should start to come into focus as he continues to progress in his throwing program.