San Diego Chargers linebacker Thomas Keiser was arrested on Sunday night on suspicion of misdemeanor battery, according to U-T San Diego. The arrest happened just hours after the Chargers beat the Chiefs to claim the final wild card berth in the AFC.Keiser was at a bar in the Gaslamp Quarter of San Diego when he got into an altercation that eventually turned into a fight."We're aware of the issue involving Thomas," the Chargers said in a statement. "We'll continue to monitor the situation and let the legal process run its course."The incident is still under investigation, but San Diego Police Captain Dino Delimitros did provide a few details to the Associated Press."He got in a fight with somebody, the bouncers got involved, the police came up and somebody demanded a citizens' arrest," Delimitros said.Keiser's bail was set at $8,000, according to U-T San Diego, and he was released at some point on Monday.The 24-year-old Keiser is in his first season with the Chargers after spending his first two years with Carolina. He opened the season on the Chargers practice squad, but was later signed to the active-roster in October. The linebacker has played in 12 games this season with three starts and is third on the team with 4.5 sacks.The Chargers open the NFL playoffs on Sunday in Cincinnati against the Bengals.