Leinster Rugby have announced the departure of Irish international second row Mike McCarthy after a four-year spell with the province.
The 35-year-old will join RC Narbonne in the French PROD2 at the end of the 2016/17 season.
Leinster have also revealed a new signing in 24-year-old back James Lowe who will join from Super Rugby side the Chiefs.
McCarthy has won 75 caps for Leinster since joining in 2013 from Connacht and won a PRO12 title in his first season lining out in the number five jersey in a 34-12 win against Glasgow Warriors in the RDS.
He has also won 19 Ireland caps since his debut in August 2011 against Scotland in a Rugby World Cup warm-up game and was a late call up to the Ireland squad in the 2015 Rugby World Cup.
"I have loved my time in Leinster Rugby and am very grateful for my time here", McCarthy said after today's announcemnt.
"But this is an excellent opportunity for me and for my young family and I am really excited for the challenge with Narbonne.
"There is a lot of ambition amongst the President and coaching team to rebuild this historic club and I'm really looking forward to playing a part in achieving this."
Before he departs, the former Connacht lock is keen to try and collect a couple more medals.
"I'm focused on a big end of season with Leinster and hopefully repaying the club and the supporters with some silverware.
"We are in a really good place on two fronts and I look forward to contributing over the next few months and finishing out as strongly as possible."
Blues head coach Leo Cullen played with McCarthy in his last season as a professional and he paid tribute to the London-born lock.
"Since Mike joined Leinster from Connacht in 2013 he has been a key figure in the dressing room. He has made a huge impact during his four seasons at Leinster and has always been fully committed when he pulled on a Leinster jersey.
"I was fortunate enough to play with Mike and he was always a fierce competitor. It was always nicer playing with him than against him!
"We would like to wish Mike and his family the very best of luck with their move to France as they depart on this exciting new adventure."
To date, McCarthy has played on 55 occasions in the PRO12 and 20 times in the Champions Cup for Leinster Rugby and last season against Toulon in the Aviva he went past the 300 caps mark in senior professional rugby.
Lowe, who has represented the Maori All Blacks, has made 39 appearances for the Chiefs with 18 tries to his name.
"James is a quality and still relatively young outside back that we have been tracking for some time, so we are delighted that he has agreed to join us", Cullen said today.
"James has picked up considerable experience from his time with the Tasman Makos, the Chiefs and the Maori All Blacks.
"We hope he can bring the learnings from his time spent with these teams and really add to our environment here."
Munster's Duncan Williams attempts to take down James Lowe at Thomond Park last November - ©INPHO/James Crombie
Lowe will join up with his new Leinster team-mates after the conclusion of the 2017 Mitre 10 Cup campaign which he will play for his home province Tasman.
"I am very excited by the challenge that lies ahead at Leinster Rugby.
"Everyone knows about Leinster and what they have achieved over the last eight years or so but I have also spoken to a few people that I know in Leinster and they have nothing but positive things to say about the club and city.
"I also really enjoyed my visit to Ireland with the Maori All Blacks last year. I am looking forward to getting stuck in and to making an impression at my new club and contributing in whatever way I can."