Walker will draw the start for the Phillies' series opener against the Mets on Thursday, Todd Zolecki of MLB.com reports.

Manager Rob Thomson said Thursday that Walker will work out of the bullpen going forward, Todd Zolecki of MLB.com reports.

Phillies manager Rob Thomson was noncommittal about Walker's spot in the rotation following the right-hander's loss to the Astros on Wednesday, Todd Zolecki of MLB.com reports.

Walker (3-5) took the loss Friday as the Phillies fell 7-4 to the Royals, coughing up six runs on eight hits and a walk over three innings. He struck out two.

The Phillies activated Walker (finger) from the 15-day injured list to start Tuesday's game versus the Marlins.

Walker (finger) will be reinstated from the injured list to start Tuesday's game against the Marlins, Corey Seidman of NBC Sports Philadelphia reports.

Walker (finger) surrendered three runs (two earned) on four hits and one walk while striking out three over 2.2 innings in his rehab start Wednesday with Double-A Reading. He also hit a batter with a pitch.

Walker (finger) will begin a rehab assignment with Double-A Reading on Wednesday, Matt Gelb of The Athletic reports.

Walker (finger) threw a bullpen session Saturday and is scheduled to throw another Wednesday at his home in Arizona, Corey Seidman of NBC Sports Philadelphia reports.

Phillies manager Rob Thomson said Thursday that Walker (finger) will not return before the All-Star break, Paul Casella of MLB.com reports.