Johnny Sexton has signed a new deal with the Irish Rugby Football Union that means he will play for Ireland and Leinster until 2021.
The Lions fly-half was named 2018 World Rugby player of the year after helping Ireland to a Six Nations Grand Slam.
Sexton, 33, was contracted to the IRFU until the end of the 2019 Rugby World Cup.
The two-time British and Irish Lions back said: "It is where I have always wanted to play so I am delighted to extend.
"We get looked after extremely well here and it is an exciting time for Irish rugby. I am looking forward to hopefully being a part of that over the next few years."