Green Bay Packers head coach Matt LaFleur was not happy with the unsportsmanlike conduct he saw from a Detroit Lions fan on the field just before Thursday night’s game at Ford Field in Detroit.

LaFleur appeared to get into a scuffle with a man who appeared to be on the field to help raise the American flag during the national anthem before the game. The two were eventually separated by Packers staff and game officials, but the incident left the veteran head coach stunned.

Green Bay Packers head coach Matt LaFleur slapped the hands of his players after a touchdown during Thursday’s game against the Detroit Lions at Ford Field in Detroit. (Image)

“I’ve never been involved in anything like that,” he told reporters after the game.

“He was talking to our players — giving them the slash-the-throat sign, and you’re trying to de-escalate, and then he got in my face.”

LaFleur expressed frustration that the fan was not removed before the situation escalated.

Matt LaFleur on the sidelines

Green Bay Packers head coach Matt LaFleur watches the game against the San Francisco 49ers at Lambeau Field in Green Bay, Wisconsin, on Nov. 24. (Photo by Jeff Hanisch-Imagn)

PACKERS HEAD COACH, LIONS FANS SEPARATE ON THE FIELD BEFORE OPPONENT GAME

“I thought it was pretty unsportsmanlike. I’ve never seen it. I’ve been to a lot of games and they usually police it a lot better. I think it was an arrogant fan who wanted to get in on the action,” he said.

“I would have liked to see security or something come in there and take him out of there because he shouldn’t have done that.”

The Packers will have a bye before heading west to play the Seattle Hawks on Dec. 15.

David Montgomery’s touchdown

Detroit Lions running back David Montgomery runs during Thursday’s game against the Green Bay Packers in Detroit. (AP Photo/Carlos Osorio)

Green Bay has struggled in division play this season, going 1-3 with Thursday’s 34-31 loss to the Lions. However, they are still in good shape to earn a wild-card playoff spot thanks to an 8-1 record against non-NFC North opponents.