Joey Barton has been accused of assaulting Barnsley manager Daniel Stendel in the tunnel.
According to Sky Sports News, Barton was involved in a tunnel fracas after Fleetwood Town's 4-2 defeat to Barnsley.
It's claimed Barton and Stendel had to be separated by stewards and police in the tunnel.
Barnsley's Cauley Woodrow alleges Barton "physically assaulted" Stendel and left him with "blood pouring from his face." He posted a Tweet shortly after the incident before deleting the post.
Barnsley have since issued a statement.
"The club can confirm there was an alleged incident in the tunnel area that took place following the conclusion of today's match, which South Yorkshire police are currently investigating.
"The club is assisting the police with its enquiries and, as a result, we are not in a position to make any further comment at this time."
Following the game, Barton was stopped from leaving the ground by local police.
The League One clash was pretty eventful on the pitch, too. Barnsley and Fleetwood played out a six-goal thriller with Fleetwood's Harry Souttar also sent off.