Walker (finger) had his scheduled bullpen session pushed back to Friday, Nick Piecoro of The Arizona Republic reports.
Walker reported no issues after tossing a simulated game earlier in the week, so it's unclear why his session is being postponed by a day. Walker's status for his next scheduled start (Sunday against the Marlins) will likely be determined by Friday's bullpen session. If all goes well, he would likely face Vance Worley in his return to the rotation. The 24-year-old owns a 3.46 ERA, 1.29 WHIP and 46:18 K:BB through 52 innings this season.