Ireland prop John Hayes is set to become only the 13th player in rugby union history to win 100 caps for his country against England at Twickenham on Saturday.
Here we look at the other players who've reached this milestone:
George Gregan (AUS):
139 caps from 1994-2007 The scrum-half was a central figure in one of the most successful eras of Wallaby rugby, forming a potent half-back partnership with Stephen Larkham as Australia won the 1999 World Cup. A losing finalist in 2003.
Jason Leonard (ENG):
119 (114 plus five for GBR and British and Irish Lions) 1990-2004 A durable front row who could play on both sides of the scrum, he overcame a neck injury. A bench player later in his Test career.
Fabien Pelous (FRA):
118 1995-2007 Captained France to a SixNations Grand Slam in 2004, the lock also led his country to the title in 2006.
Philippe Sella (FRA):
111 1982-2005 One of the best centres the game has known, Sella was the complete midfielder with pace, power, vision and an expert passer too. Stood out even amongst several highly talented France teams.
George Smith (AUS):
110 2000-2010 The openside flanker was a champion performer at the breakdown with the ball skills to link moves in open play too. Retired from Wallaby duty in February.
Gareth Thomas (WAL):
103 (100 plus three for Lions) 1995-2007 Versatile back who was a popular captain with both Wales and the Lions when standing in after Brian O'Driscoll was injured on the 2005 tour of New Zealand. Reached his Wales century in the dramatic 2007 World Cup loss to Fiji.
Stephen Larkham (AUS):
102 1996-2007 Started at full-back but moved to fly-half by Australia coach Rod Macqueen. Fine tactician with good mix of handling and kicking skills. Landed huge drop-goal to seal victory over South Africa in 1999 World Cup semi-final.
Percy Montgomery (RSA):
102 1997-2008 The Springbok started as centre before switching to full-back where his goalkicking played a key role in the Springboks' 2007 World Cup triumph.
Alessandro Troncon (ITA):
101 1994-2007 One of the key figures in the Italy side that transformed the Five Nations into the Six Nations. The passionate scrum-half, a sound passer and kicker, was at the heart of some of the Azzurri's greatest results.
Chris Paterson (SCO):
100 2000- Like Hayes, yet to hang up his boots. His 100th cap appearance was cut short when he went off against Wales this month with a serious kidney injury. Has played in several positions behind the scrum but is now renowned as one of the leading goalkickers currently in world rugby.
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