Diaz (biceps) was activated from the 15-day injured list Friday, C. Trent Rosecrans of The Athletic reports.
Diaz will make his return Friday as expected, rejoining the team after missing a little over three weeks while nursing a biceps injury. The reliever owns a 2.40 ERA and 1.00 WHIP with 36 punchouts and two saves over 30 innings in 27 appearances this season. Diaz should work his way back into a high-leverage role pretty quickly, potentially contending for saves given Hunter Strickland's recent struggles.