The San Diego Chargers are being investigated by the NFL for using "Stick 'em" during Monday's game against the Denver Broncos.

According to Fox Sports' Jay Glazer, a Chargers equipment man was reportedly seen handing out little hand towels on the field with the illegal substance inside.

A line judge saw the towels and had them confiscated. They have since been sent to the league.

San Diego blew a 24-0 halftime lead against the Broncos and lost, 35-24.