The Manchester United skipper retired from international football after a huge row at the 2002 World Cup with then manager Mick McCarthy.
He's now been replaced by Brian Kerr, and Keane has changed his mind about playing for his country.
Keane met up with Kerr last week and told him he wants to try and help Ireland qualify for the 2006 World Cup.
That's the next major championship that Ireland will be able to play in, as they didn't qualify for this summer's Euro 2004 tournament in Portugal.
The Republic's World Cup qualification campaign starts with a home game against Cyprus in September.
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