Ireland lock James Ryan has signed a three-year contract to the end of the 2022/23 season.
Ryan made his Ireland debut at the age of 20, coming off the bench against the USA in New Jersey in 2017 and scored his first international try less than 60 seconds later.
He has gone on to become a fixture in the Irish pack, winning 24 caps, including four starts in Ireland's Grand Slam Six Nations campaign of 2018.
Ryan has won a Heineken European Champions Cup and two Pro 14 titles with Leinster.
"I am delighted to sign an IRFU contract," he said.
"A lot has been packed into the start of my professional career with both Ireland and Leinster and there has been some great success and a few disappointments but I am involved in two very exciting squads that want to be challenging for trophies."
IRFU high performance director David Nucifora sees Ryan becoming a leader for the nation on the pitch: "James is still a young man but he has delivered consistent high level performances for both Ireland and Leinster.
"He is growing into a leadership role with the national team and has a big future for both Ireland and Leinster."