Liverpool boss Brendan Rodgers has been warned against publicly criticising match officials.
Referees' chief Mike Riley and his members are angered by Rodgers continuing to claim his club are victimised by officials, regarding it as a tactic to seek an advantage.
"Brendan Rodgers isn't the first manager to try it on," said a referees' source to the Mail on Sunday.
"It won't work for Brendan, either. There have been phone calls which have relayed that message. It is pretty clear."