Pouncey and his twin brother Mike, a center for the Miami Dolphins, were photographed wearing hats that read "Free Hernandez" during their co-birthday party in Miami on Saturday night.
Hernandez played at the University of Florida with the Pounceys from 2007-09. The former New England Patriots tight end is charged with murder in the killing of Boston semi-pro football player Odin Lloyd. Hernandez has pleaded not guilty.
Maurkice Pouncey posted on his Twitter account Monday he understands the "seriousness of the situation involving my former teammate." Pouncey added he regrets making light of the situation and apologized if he offended anyone.
The Steelers had no immediate comment.
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