Allen was absent during Wednesday's OTA session due to a hamstring injury, Ben Standig of The Athletic reports.
Allen, an undrafted rookie out of UCLA, has impressed during OTAs thus far, and assuming the hamstring issue isn't too significant, he could still have a good chance at cracking the 53-man roster heading into the upcoming season. During his collegiate career, Allen saw work as a wide receiver, running back and kick returner.