The Football Association will consult police and view video evidence before deciding whether to charge Sheffield United manager Neil Warnock.
Warnock had to be escorted from the dugout by a police officer against Leeds
The 57-year-old was sent to the stands by referee Graham Poll after venting his anger at counterpart Kevin Blackwell over Leeds' physical play.
Warnock could now face a touchline ban in the Premiership next season.
"We will speak to the police, and study video evidence before deciding what action to take," a FA spokesman said.
Warnock was furious after Gary Kelly's late challenge on Blades defender Craig Short just before the break.
The Blades boss then had to be escorted by a police officer down the tunnel as he refused to leave quietly after Poll had sent him off.
"I'm disappointed to be sent off and I don't think it was warranted," he said.
Warnock also expressed his anger towards Blackwell's players.
The Leeds manager was Warnock's assistant at Bramall Lane until he walked out to join their Yorkshire rivals three years ago.
Warnock added: "I made a comment to Blackie [Leeds coach Kevin Blackwell] about his players' tackles and the fourth official took offence to that.
"Mr Robinson (the fourth official) did the same a few weeks ago when Mark Halsey was refereeing.
"Some of the comments that were directed at him from some of Kevin's staff were more direct to the official.
"It's a vendetta to get me sent off. I just thought the fourth official totally overreacted."