Paddy Kenny allegedly sent abusive messages to QPR's technical director Mike Rigg and chairman Tony Fernandes over the weekend, forcing the west Londoners to make a formal complaint to Leeds United.
Kenny, 34, left Loftus Road in the summer after two years with the club to join former boss Neil Warnock at Elland Road, after it was made clear the he would be replaced at QPR.
Mark Hughes' new No.1 Rob Green endured a nightmare debut as the club lost 5-0 at home against Swansea on the opening day of the season and it is understood that Kenny sent abusive messages to Rigg and Fernandes late on Saturday night, and well into the early hours of Sunday morning.
It has also been alleged that Rigg went on to receive phone calls up until 3am.
Kenny recently found himself in hot water after describing QPR as a "tin pot club" on Twitter.