Celtic manager Neil Lennon faces disciplinary action over his language during his side's 1-1 draw at St Mirren, the Scottish Football Association announced on Wednesday.
The SFA has issued Lennon with a notice of complaint that accuses him of "failure to behave in a responsible manner as an occupant of the technical area by repeated use of offensive, insulting and abusive language".
Live television coverage of the game on Sunday suggested Lennon swore at St Mirren captain Jim Goodwin after he committed a tackle near the visiting dug-out.
Lennon has seven days to respond to the notice of complaint.
The charges arose from an incident in the 75th minute of the Scottish Premier League game, when Goodwin produced a robust but legal tackle on Celtic's Dylan McGeouch.
According to television footage, Lennon appeared to say: "Well done Jim, think you're a hard man, eh?" before swearing.
Goodwin, who played alongside Lennon at Celtic, played down the incident before the SFA announced that they were taking disciplinary action.
"McGeouch had just come on, I flew into a tackle with him and Lenny was just protecting his player. He barked a few words at me and I have no problem with that," he told the Daily Record.
"I'm just happy the Sky microphone wasn't close enough to pick up my unprintable reply or else I'd be in trouble myself."
Celtic had Victor Wanyama sent off in the game, while St Mirren's Esmael Goncalves has been issued with a notice of complaint after apparently diving to win a penalty.
Lennon described referee Bobby Madden's display as the "most appalling refereeing performance I have seen for a long, long time".