Arrieta (thumb) is scheduled to throw a bullpen session Saturday, Jordan Bastian of MLB.com reports.

Arrieta was playing catch prior to Saturday's game against the Pirates, and the right-hander is slated throw his second bullpen session in the last three days. Arrieta was placed on the 10-day injured list with a right thumb abrasion Tuesday, but he could return as early as next weekend at Detroit.

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