The NFL is investigating Pittsburgh Steelers wide receiver George Pickens for wearing an accessory that isn’t allowed, according to ESPN. 

Pickens appeared to have eye black with an explicit message when shown up close during the "Sunday Night Football" broadcast. 

The phrase "Open F---ing Always" appeared to be written in silver or white across his eye black. The explicit message is enough for the league to investigate.

All messages on any part of a uniform must be approved before a player takes the field. 

CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM

George pickens runs

Pittsburgh Steelers wide receiver George Pickens runs after a catch against the Dallas Cowboys during the fourth quarter at Acrisure Stadium. Dallas won 20-17. (Charles LeClaire/Imagn Images)

The NFL prohibits players from "wearing, displaying or otherwise conveying personal messages either in writing or illustration, unless such message has been approved in advance by the League office."

Steelers head coach Mike Tomlin was asked about Pickens’ message on his eye black, and he said, "I don’t know what messaging you’re talking about," according to ESPN. 

COWBOYS' JOURDAN LEWIS BLASTS GEORGE PICKENS AFTER STEELERS STAR GRABS HIS FACEMASK IN LOSS: ‘WEAK’

Fines will be released Saturday, which would include Pickens’ violation if he is found guilty of breaking the NFL's messaging rule. 

On the field, Pickens also pulled the face mask of Cowboys cornerback Jourdan Lewis after the final whistle blew in Pittsburgh's 20-17 to Dallas. Lewis appeared to say something to Pickens. Pickens took exception and grabbed Lewis' face mask.

George Pickens catches pass

Pittsburgh Steelers wide receiver George Pickens (14) makes a catch in front of Dallas Cowboys safety Donovan Wilson (6) during the fourth quarter at Acrisure Stadium. (Barry Reeger/Imagn Images)

Lewis was spotted calling Pickens "weak" as he walked into the Acrisure Stadium tunnel toward the road locker room, adding that the Steelers need to find another receiver. 

Pickens’ snap count was a topic of discussion during the game. Tomlin said Pickens was playing with "snap management" restrictions during a game in which he had just three catches for 26 yards. Pickens played just 34 snaps, the lowest count of his career. 

Pickens' effort has also been questioned.

George Pickens runs on field

Pittsburgh Steelers wide receiver George Pickens runs after a catch against the Dallas Cowboys during the fourth quarter at Acrisure Stadium. Dallas won 20-17. (Charles LeClaire/Imagn Images)

CLICK HERE TO GET THE FOX NEWS APP

This season, Pickens has caught 23 passes for 310 yards in five games. He’s coming off his first season of 1,000 yards receiving after hauling in 63 passes for 1,140 yards and five touchdowns in 2023. 

 Follow Fox News Digital’s sports coverage on X, and subscribe to the Fox News Sports Huddle newsletter.