The incident, which the NFL will review, took place in the first half of Sunday's Week 16 matchup with the Detroit Lions.

DK Metcalf, who is in his seventh NFL seasn and first with the Steelers, was seen appearing to swing his fist at a fan ...

Pittsburgh Steelers wide receiver DK Metcalf was seen punching a Detroit Lions fan on the sideline during the Week 16 game. Will the Steelers wideout face a suspension? Here's what we know.

Officials didn't see the incident, and Metcalf wasn't disciplined on the field. But the NFL office will surely take a closer look.

Steelers wide receiver DK Metcalf appeared to get into an altercation with a Lions fan in the front row behind the Steelers bench in Week 16.