Cape Town - Roy Keane cited the difficulty of doing two jobs as his reason for leaving English Premiership club, Aston Villa.
Sport24 reported on Friday that Aston Villa's assistant manager Roy Keane has left the club with immediate effect.
Keane has now told the BBC why he quit the struggling English Premiership club.
"Ultimately, my roles with Villa and Ireland and combining my commitment to these have become too much. It isn't fair to either Villa or Ireland, so I've made this decision," said Keane.
Paul Lambert, currently Villa boss, said the club would aim to fill the position as soon as was practically possible.
Villa are struggling in the league with just 12 points from their opening 12 games.
Paul Lambert must now take charge on his own when Aston Villa travel to Burnley on Saturday. The match kicks off at 17:00.