Barnett spent a short time in jail and was then released.

According to a news release from Appleton police, Barnett was involved in a fight at the Wet Nightclub at 344 W. College Ave. in Appleton at about 2 a.m. Sunday.

  Appleton Police News Release

He was arrested, taken to Outagamie County Jail in Appleton and released within an hour after posting a $500 cash bond.

WGBA-TV in Green Bay is reporting the Barnett pushed a woman down in the club and bouncers escorted him out. Barnett then allegedly began arguing with the bouncers and police came to the scene. It was unclear whether police were called or saw the argument.

Barnett knew the woman, and she did not suffer serious injuries, WGBA reported. Barnett was booked on a battery charge.

Barnett appeared for a charity softball event later Sunday, participating in a preliminary game involving Packers players and sponsors. But he left the field before the regular game and didn't return.

He was unavailable for comment.

In a statement issued after the game, the team said, "We are aware of the incident in Appleton involving Nick Barnett. The Packers organization is going to defer further comment until we have had a chance to speak with Nick and gather more facts."

Police asked that anyone with information about the nightclub incident contact the department at 920-832-5500.

Barnett is in his fifth year with the Packers, who selected him in the first round of the NFL Draft in 2003. Barnett has been the team's starting middle linebacker since his rookie season.

The Packers rewarded Barnett with a six-year, $34.85 million contract extension in April.

His arrest comes in the midst of the Packers' organized team activities. The voluntary workouts, which started May 30, resume Monday and end Tuesday.

"It's unfortunate," said veteran long snapper Rob Davis, who played in the softball game. "Nick's a good kid. He's been a damn good player for us. I'm just going to wait until the facts come out. I'm not going to think about it."