Kieran Marmion will remain at Connacht until at least the end of the 2022-23 season after agreeing a three-year contract extension.
Marmion joined the province's academy in 2011 and has racked up over 160 appearances since his arrival.
The scrum-half represented Ireland at underage level before progressing to the senior ranks, where he has been capped 27 times since making his debut against Argentina in 2014.
After finalising the deal for the 27-year-old, Connacht coach Andy Friend said: "Kieran has been an outstanding player for Connacht and for Ireland.
"He is a diligent professional and through his hard work he has progressed through the Connacht Academy and on to play for Ireland.
"His progress demonstrates the support that is available to players through our academy pathway.
"Kieran’s commitment to Connacht for a further three seasons demonstrates his ambition to contribute at provincial and international level in the coming years.
"His signing also ensures that we continue to retain a squad equipped to compete at the highest level of European club rugby".