Neil Walker could be back in the Pirates' lineup by Sunday. (Photo Credit: David Hague)

Pirates second baseman Neil Walker will begin his rehab assignment Thursday at Double-A Altoona. Walker will play two games in Altoona, according to 93.7 The Fan's Dan Zangrilli, starting with Thursday night's game against the Richmond Flying Squirrels at 6:30 p.m. ET.

Walker could be back on the Pirates' roster as early as Sunday in New York, per Travis Sawchik of the Pittsburgh Tribune-Review. He injured his right hand on April 26 sliding into second base and had to get six stitches after Cardinals shortstop Pete Kozma accidentally spiked him. Walker was originally day-to-day, but the Pirates placed him on the 15-day disabled list Friday and recalled infielder Jordy Mercer.

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