In an interview scheduled to be broadcast Tuesday night on ITV4, Keane once again addresses old stories of discontent between him and his ex-manager, citing the desire for power as one of the main reasons the two were torn apart.
Keane spoke on the subject as part of the television show Best of Enemies, which chronicles the Irishman's feud with Patrick Vieira. Mike Walters of Mirror Football reports some of his latest Fergie accusations:
He scowled: "The manager accused me of trying to manage Manchester United behind his back - but managing the dressing room, and pulling up players who stepped out of line, was part of my job."
And he claimed Ferguson was still "striving" to exert "control and power" at Old Trafford - where new boss David Moyes is struggling, with United currently 13 points behind Premier League leaders Arsenal.
Ferguson's 27-year reign as manager of United is among the most well-covered managerial voyages in the history of the sport, but his fractious relationship with one of his greatest players is something that's been discussed at length since Keane left Old Trafford in 2005.
Given the amount of time that the Scot spent as manager of United, bringing them the kind of continued success that few other clubs have experienced, one may understand if letting go were to be difficult for the 71-year-old.
The club figure nonetheless remains at the Theatre of Dreams in a directorial position, with nowhere near as much influence on the daily running of things he once had.
However, his figure still looms over United at every home game, casting a shadow over Moyes, who is struggling badly as the club's replacement.
Keane's latest comments won't be a complete surprise, given the back-and-forth manner in which the pair have quarrelled over recent years. Walters even reports that only now will the Republic of Ireland assistant manager go to watch his former team play, following Ferguson's retirement.
The Times' Matt Dickinson sheds more light on the recent quotes, with Keane adding that Ferguson doesn't rank as the best manager he played under:
The feud continues. Roy Keane pointedly tells ITV the best manager he played under was Clough not Ferguson in Keane v Vieira documentary— Matt Dickinson (@DickinsonTimes) December 9, 2013
United now sit ninth in the Premier League table, 13 points away from leaders Arsenal, winning just three of their eight home league matches thus far under Moyes.
Right now, the club could do with a player of precisely Keane's qualities on the pitch—someone with the ability to lead from the middle and capable of winning games without the ball.
Ferguson and Keane remain fraught with animosity toward one another to this day, but it is fair to say United could use the leadership and will to win of both men to help them out of their current slump.