Aston Villa have announced the Roy Keane has left his position as assistant manager "with immediate effect."
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Keane, 43, leaves his role as Paul Lambert's No. 2 with the club 16th in the Premier League table.
The former Sunderland and Ipswich Town manager, who only moved to Villa Park in July, has now stepped down in order to focus his efforts on his other job as Martin O'Neill's assistant with the Republic of Ireland national team.
Roy Keane has relinquished his role as #AVFC assistant manager with immediate effect. Full details to follow on our website.
- Aston Villa FC (@AVFCOfficial) November 28, 2014
"Ultimately, my roles with Villa and Ireland and combining my commitment to these have become too much," he said in a statement. "It isn't fair to either Villa or Ireland, so I've made this decision.
"I'd like to thank Paul for giving me a great opportunity to come to a brilliant football club, I've really enjoyed my experiences at Villa and I wish the management team, the players, the supporters and the club nothing but the best going forward."
Lambert added: "Roy came to me this morning and he informed me that, ultimately, the difficulty of combining both roles has prompted his decision, which I respect totally.
"In the brief period we have worked together he has been great in the role and I understand his reasons for leaving."
CEO Tom Fox added: "We thank Roy for his time at the club and we wish him the best with Ireland.
"Our focus now will be on working with Paul to identify the right person to work alongside him and to help us continue on our journey to return the club to its rightful place in the Premier League."