The former Celtic, Aston Villa and Sunderland boss will be unveiled on Saturday, with ex-Manchester United skipper Keane to be his no.2, and the 61-year old said that he and his offsider will go in with a 'bad cop, bad cop' mentality to improve the quality of Irish football.
"[Keane] is coming with me," confirmed O'Neill. "Personally speaking I think he'll be great for me but more importantly he'll be great for the Republic of Ireland.
"I'm the bad cop and he's the bad, bad cop. We're excited by it."
O'Neill, who represented Northern Ireland as a player, replaces Giovanni Trapattoni at the helm of the RoI team.
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