Speaking in Celtic View, McCann pointed the finger at what he termed the "PR stunts" from Brian Dempsey, a former shareholder central to moves to buy out McCann's holding in the Parkhead club.
McCann said: "It is now clear that Brian Dempsey's plans to attack the management of Celtic using a barrage of criticism and PR stunts is now underway, and will continue for several months." McCann has found himself under intense pressure since the resignation of the club's manager, Wim Jansen, but he insists progress is still being made.
In reply, Dempsey said: "We hope Mr McCann took good legal advice before penning this article and that it was not written in a fit of petulance."
Manchester United are not prepared to sell Gary Pallister back to Middlesbrough until after the World Cup.
Bryan Robson, the Boro manager, has made a bid, believed to be worth pounds 2m, for the former England central defender. United are considering the offer, but are in no hurry to let Pallister go. They want to wait and make sure Jaap Stam, who completes his pounds 10.75m move to United from PSV Eindhoven on 1 July, comes through the World Cup for the Netherlands unscathed.
Steve Staunton has turned down a lucrative new four-year contract with Aston Villa and is to leave the club.
The Republic of Ireland defender will take advantage of the Bosman ruling to move as a free agent, with his former club, Liverpool, Tottenham and Blackburn all being linked with possible attempts to sign him.
The French defender Remi Garde, 32, has signed a new one-year deal with Arsenal after changing his mind about retiring from the game. The Gunners have also given a new one-year contract to John Lukic but have released Scott Marshall and Chris Kiwomya.
The Italian international midfielder Roberto di Matteo has told Chelsea he wants to stay at Stamford Bridge for the foreseeable future - quashing media reports that he has been looking to return to Italy.
Everton's goalkeeping coach Mervyn Day, the former West Ham No 1, is in line to replace Les Reed as assistant manager at Charlton Athletic. On Day's recommendation, Everton are paying pounds 40,000 for Stenhousemuir's Scotland Under-21 goalkeeper, Neil Alexander.Reuse content