Shane Horgan has agreed a new contract with the Irish Rugby Football Union which will see him stay at Leinster until the end of the 2010 season.
"We are delighted that Shane has committed his future to playing in Ireland for Leinster," said IRFU Chief Executive Philip Browne.
"The IRFU will continue with its strategy of keeping as many of our leading players within our provincial structures in Ireland."
Leinster Chief Executive Mick Dawson was equally happy.
"Since making his senior debut for the province a little under 10 years ago, Shane has gone from strength to strength culminating in selection for the British & Irish Lions tour to New Zealand in 2005," said Dawson.
"Shane has been a consistent force in the backline, be it in the blue of Leinster or indeed the green of Ireland.
"I am sure that I speak on behalf of the entire Leinster support when I say how delighted we are that he has followed the likes of Brian O'Driscoll and Gordon D'Arcy in re-signing for the province for the coming years."