Referees' body PGMOL says it "strongly refutes" suggestions by Liverpool boss Jurgen Klopp that referee Paul Tierney's actions were "improper" during Sunday's 4-3 win over Tottenham.
The Football Association are also looking into Klopp's post-match comments after he said Tierney appears to have something "against" his team.
The German was shown a yellow card for celebrating Liverpool's 94th minute winner in front of the fourth official and later claimed what Tierney said to him was "not ok."
The PGMOL (Professional Game Match Officials Limited), said Tierney "acted in a professional manner" throughout the game and when cautioning Klopp.