Leinster player Sean O' Brien in action during the Heineken Cup Quarter Final match between Leinster and Leicester Tigers at Aviva Stadium on April...
Lachlan Turner of Exeter challenged by Leinster's Sean OBrien during Leinster vs Exeter Chiefs - the European Rugby Champions Cup rugby match at...
Johannesburg , South Africa - 17 April 2023; Contact skills coach Sean O'Brien looks on as Leinster players huddle during a Leinster Rugby squad...
Gauteng , South Africa - 14 April 2023; Contact skills coach Sean O'Brien during the Leinster Rugby captain's run at Emirates Airlines Park in...
Owen Farrell of Saracens offloads despite the tackle of Robbie Henshaw as Sean O' Brien looks on during the Champions Cup Final match between...
Tigers player Toby Flood is tackled by Leinster player Sean O' Brien during the Heineken Cup Quarter Final match between Leinster and Leicester...
Brive's Shaun Perry is tackled by Leinster's Stan Wright and Sean O'Brien during round 5 of the European Cup match at the Royal Dublin Society...
Bilbao , Spain - 12 May 2018; Leinster players, from left, Rhys Ruddock, Jack Conan, Scott Fardy, Sean O'Brien, Jordi Murphy and Josh van der Flier...
Dublin , Ireland - 14 April 2018; Sean O'Brien of Leinster is tackled by Luca Bigi of Benetton Rugby during the Guinness PRO14 Round 20 match between...
Llanelli , United Kingdom - 9 March 2018; Leinster captain Sean O'Brien runs out ahead of the Guinness PRO14 Round 17 match between Scarlets and...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Gareth Steenson of Exeter Chiefs during the European Rugby Champions Cup...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Sam Simmonds of Exeter Chiefs during the European Rugby Champions Cup...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Sam Simmonds of Exeter Chiefs during the European Rugby Champions Cup...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Sam Simmonds of Exeter Chiefs during the European Rugby Champions Cup...
Sean OBrien of Leinster team in action challenged by Henry Slade of Exeter Chiefs during the European Rugby Champions Cup rugby match at Aviva...
Sean OBrien of Leinster team in action challenged by Sam Simmonds of Exeter Chiefs during the European Rugby Champions Cup rugby match at Aviva...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Henry Slade of Exeter Chiefs during the European Rugby Champions Cup Pool...
Leinster's Sean O'Brien tackled by Exeter Chiefs' Henry Slade during the European Rugby Champions Cup, Pool Three match at the Aviva Stadium, Dublin.
Dublin , Ireland - 16 December 2017; Leinster players, from left, Devin Toner, Scott Fardy, Rob Kearney, Sean O'Brien, Jack McGrath, Jordan Larmour,...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Henry Slade of Exeter Chiefs during the European Rugby Champions Cup Pool...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster is tackled by Ben Moon of Exeter Chiefs during the European Rugby Champions Cup Pool 3...
Dublin , Ireland - 16 December 2017; Sean O'Brien of Leinster reacts after Exeter Chiefs scored their second try during the European Rugby Champions...
Dublin , Ireland - 16 December 2017; Olly Woodburn of Exeter Chiefs is tackled by Sean O'Brien of Leinster during the European Rugby Champions Cup...
Dublin , Ireland - 16 December 2017; Olly Woodburn of Exeter Chiefs is tackled by Sean O'Brien of Leinster during the European Rugby Champions Cup...
Dublin , Ireland - 16 December 2017; Olly Woodburn of Exeter Chiefs is tackled by Cian Healy, left, and Sean O'Brien of Leinster during the European...
Dublin , Ireland - 16 December 2017; Henry Slade of Exeter Chiefs is tackled by Robbie Henshaw, left, and Sean O'Brien of Leinster during the...
Dublin , Ireland - 15 December 2017; Jack McGrath, left, and Sean O'Brien during the Leinster captain's run at the Aviva Stadium in Dublin.
Dublin , Ireland - 15 December 2017; Rob Kearney during the Leinster captain's run at the Aviva Stadium in Dublin.
Dublin , Ireland - 15 December 2017; Jack McGrath, left, and Sean O'Brien during the Leinster captain's run at the Aviva Stadium in Dublin.
Dublin , Ireland - 15 December 2017; Sean O'Brien during the Leinster captain's run at the Aviva Stadium in Dublin.
Leinster's Sean O'Brien is tackled by Exeter Chiefs' Jonny Hill during the European Rugby Champions Cup match between Exeter Chiefs and Leinster...
Leinster's Sean O'Brien is tackled by Exeter's Jonny Hill and Jack Yeandle during the European Rugby Champions Cup, Pool Three match at Sandy park,...
Sean OBrien of Leinster is tackled by Jonny Hill and Jack Yeandle of Exeter Chiefs during the European Rugby Champions Cup match between Exeter...
South Africa's prop Tendai Mtawarira is tackled by Ireland's flanker Sean O'Brien during the rugby union international Test match between Ireland and...
Ireland's flanker Sean O'Brien is tackled during the autumn international rugby union test match between Ireland and South Africa at the Aviva...
Ireland's flanker Sean O'Brien is tackled during the autumn international rugby union test match between Ireland and South Africa at the Aviva...
Belfast , United Kingdom - 28 October 2017; Sean O'Brien of Leinster is tackled by Sean Reidy, left, and Kieran Treadwell of Ulster during the...
Belfast , United Kingdom - 28 October 2017; Sean O'Brien of Leinster is tackled by Rory Best of Ulster during the Guinness PRO14 Round 7 match...
Dublin , Ireland - 29 September 2017; Sean O'Brien of Leinster is tackled by Cornell du Preez, left, and Phil Burleigh of Edinburgh during the...
Dublin , Ireland - 29 September 2017; Sean O'Brien of Leinster is tackled by Cornell du Preez, left, and Phil Burleigh of Edinburgh during the...
Dublin , Ireland - 29 September 2017; Sean O'Brien of Leinster is tackled by Cornell du Preez and Phil Burleigh of Edinburgh during the Guinness...
Dublin , Ireland - 29 September 2017; Sean O'Brien of Leinster is tackled by Cornell du Preez and Phil Burleigh of Edinburgh during the Guinness...
Northampton Saints' Ken Pisi is tackled by Leinster's Sean O'Brien during the Heineken Cup match at Franklins Gardens, Northampton.
Wasps' Chris Bell is tackled by Leinster's Sean O'Brien and Dave Kearney during the Amlin Challenge Cup, Quarter Final match at Adams Park, High...
Leinster's Sean O'Brien beats the tackle of Ulster's Ruan Pienaar to set up Leinster's second try during the Heinken Cup Final at Twickenham, London.
Sean O'Brien of Leinster is tackled by Joe Worlsey of Wasps during the Heineken Cup match between London Wasps and Leinster Rugby at Twickenham on...
Dublin , Ireland - 4 September 2017; Former French captain Raphaël Ibañez, left, with Leinster players from left, Sean O'Brien, Scott Fardy and...
Dublin , Ireland - 4 September 2017; Leinster players, from left, Sean O'Brien, Scott Fardy and Jamison Gibson-Park squad training at the UCD in...
Dublin , Ireland - 4 September 2017; Leinster players Sean O'Brien, left, and Scott Fardy during squad training at the UCD in Belfield, Dublin.
Dublin , Ireland - 4 September 2017; Leinster players, from left, Sean O'Brien, Scott Fardy and Jamison Gibson-Park during squad training at the UCD...
Castres Olympique's Charles Sika is tackled by Leinster's Sean O'Brien and Jamie Heaslip during the thrid round of the European Cup match at the RDS...
Castres Olympique's Charles Sika is tackled by Leinster's Sean O'Brien during the thrid round of the European Cup match at the RDS in Dublin on...
Glasgow Warrior's DTH Van der Merwe is tackled by Leinster's Sean O'Brien and Simon Shawe during the Magners League match at the Firhill Stadium,...
Leinster's Sean O'Brien takes the ball at a line out during the Heineken Cup match at Firhill Stadium, Glasgow.
Leinster players, left to right, Girvan Dempsey, Shane Horgan, Leo Cullen and Sean O'Brian , show Matthew McGrath the Heineken Cup during a visit to...
Leinster's Sean O'Brien tackles Castres Olympique's Gideon Lensing during the Heineken Cup match at the Royal Dublin Soceity, Dublin.
Leinster's Sean O'Brien scores a try against Montpellier during the Heineken Cup Pool three match at the RDS, Dublin, Ireland.
Leinster's Sean O'Brien scores a try against Montpellier during the Heineken Cup Pool three match at the RDS, Dublin, Ireland.
Leinster's Sean O'Brien tries to break through the Bath defence during the Heineken Cup match at the Recreation Ground, Bath.