Former Manchester United captain Roy Keane has lashed out again at the retired Old Trafford manager Alex Ferguson.
The fiery Irishman claims in a new documentary that the former United manager is trying to exert "control and power" at the struggling defending champions and has a "massive ego".
United have endured a difficult start to life under Ferguson's successor David Moyes, having already lost three league games at Old Trafford, leaving them in ninth spot and 13 points behind front-runners Arsenal.
Keane, who left United in 2005 after a disagreement with Ferguson, was speaking in a TV documentary called 'Keane and Vieira: The Best of Enemies' concerning his rivalry with former Arsenal captain Patrick Vieira.
Keane says Ferguson's strongest trait was his "ruthlessness", while labelling "loyalty" his biggest weakness.
Ferguson said in his autobiography that his authority at Old Trafford would have been undermined had he not forced Keane out in 2005.
