Liverpool coach Jürgen Klopp has been charged by the Football Association with comments he made after his team drew against West Ham.
Klopp said the performance of Kevin Friend was influenced by the decision to allow Sadio Mane's goal, which should be ruled out for offside.
The association says Klopp was charged with "commenting on the referee's integrity and / or implied bias".
He has until 18:00 GMT on Monday, February 18, to answer the charges.
The Premier League game at London Stadium on 4 February ended 1-1.
Mane put Liverpool ahead in the first half, but James Milner was offside.
Michail Antonio made up for West Ham before the break, but Klopp said Friend had "no longer wanted to open the gap".
"I've heard our goal was offside, I'm pretty sure the referee knew that," Klopp told BBC Sport.
"In 50-50 situations, it was always a free kick for the other team, which was tough and did not make life easy."
In an interview with Sky Sports, the German added: "If I know that as a human being in the first half I made a big mistake, I do not want to open the gap anymore.
"Referees are obviously people, and I understand that, but I did not do it during the game because I had no idea our goal was offside."