Wittgren struck out two in a perfect inning during Monday's 7-4 loss to the Angels.
Wittgren started the season poorly, but he's been better in May, posting a 1.29 ERA, 0.14 WHIP and nine strikeouts in seven innings this month. The 29-year-old has been eclipsed by Emmanuel Clase and James Karinchak for closing duties, but Wittgren's recent success suggests he could still work his way back into a high-leverage role.