The Scottish Football Association has written to Neil Lennon for the third time in just over a week to ask the Celtic boss to explain comments he made ahead of their clash with St Johnstone on Sunday.
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Lennon has already been contacted to explain comments in the wake of the Celtic's defeat in the League Cup final defeat against Kilmarnock and after he was sent off during the Hoops' 3-2 defeat in the Old Firm clash with Rangers on Sunday.
And on Tuesday, Lennon was quoted in the Edinburgh Evening News on Tuesday saying: ''It will be nice just to be able to go out and think only about winning a game of football - and maybe have a decent refereeing performance into the bargain.''
The SFA's compliance's officer Vincent Lunny has written his latest letter as Lennon's most recent comments allegedly breach rule 69, which prevents managers remarking on referees before games, a rule that was implemented at the start of the season. The Northern Irishman has until Friday to respond.
The former Hoops skipper was served with a notice of complaint by Lunny on Monday after being sent off by referee Calum Murray at half-time in the 3-2 SPL defeat by Rangers at Ibrox on Sunday, a decision which Lennon described as ''a joke''.
Lunny had already written to Lennon asking him to explain his comments following last week's 1-0 League Cup final defeat against Kilmarnock at Hampden, when he referred to referee Willie Collum's decision not to award the Hoops a late penalty as ''shocking'' and ''criminal''.
In October, Hearts manager Paulo Sergio escaped with a warning for his comments about match official Iain Brines before his side's SPL win over Dunfermline. Brines had riled the Portuguese boss when he disallowed an Eggert Jonsson goal for handball during the Jambos' 1-0 League Cup defeat by Ayr United the previous month.
Sergio said: ''I am not happy with that. I am not happy to have him at Hearts games, I'm sorry.''
Sergio was also censured for breaching rule 68 which, among other things, relates to the indication of ''bias or incompetence on the part of such match official; or make remarks about such match official(s) which impinge on his character''.
Meanwhile, Lennon has threatened to stop using his Twitter account. Earlier in the day the Celtic boss appeared to be in a chirpy mood, tweeting ''Ive best job in the world'' (sic) after saying: ''enjoy your morning...am going to watch these great young players train...its such a buzz.'' (sic).
However, after some prolific tweeting during the afternoon, his attitude appeared to change and he tweeted: ''Guys enough with the hate and bitterness on both sides..this twitter is supposed to be fun.i will stop unless you stop.''