Zimmermann (biceps) won't return Sunday as previously expected after spraining his ankle while exercising, Roch Kubatko of MASNSports.com reports.

Biceps tendinitis has sidelined Zimmermann for more than two months. He was on the verge of a return before suffering the setback in a training-room accident. Exactly how serious of a setback the sprain is remains to be seen. Keegan Akin will get the nod Sunday against Boston.

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