Martinez (foot) will move his rehab assignment to Triple-A Toledo on Monday, Evan Woodbery of MLive.com reports.
Martinez had just started picking up reps in the outfield and is now ready to step up the level of competition after homering for High-A Lakeland on Saturday. According to manager Brad Ausmus, Martinez could be activated at some point during the upcoming four-game weekend series against the Angels. How he responds to Triple-A pitching will likely be a determining factor in his eventual return date.