In the first test against England he was escorted off the field after suffering concussion following a clash of heads with fellow All Black Xavier Rush.
He was a late withdrawal from the second England test and then played 70 minutes against Argentina before again leaving the field due to dizziness.
As well as two world cups, the All Blacks won seven Tri-Nations titles, completed three successful Grand Slam tours and won the Bledisloe Cup eight times.
He made his debut in 2001 for the Crusaders, and was selected for the All Blacks' 2001 end-of-year tour, despite having played only eight minutes of Super 12 rugby.
He was made captain at the age of 23 for the first time against Wales as regular captain Tana Umaga was rested.Mc Caw's debut international test was against Ireland at Lansdowne Road on 17 November 2001.His first touch of the game resulted in a knock-on when he was hit in a tackle and New Zealand were trailing the Irish 16–7 at half-time.During that series, Mc Caw realised his All Blacks dream could be attainable.Although the then 20-year-old Mc Caw had only played seventeen matches for Canterbury, John Mitchell, the new All Black coach, selected him for the 2001 end of year tour to Ireland, Scotland and Argentina.He is the most capped test rugby player of all time, and has won the World Rugby player of the year award a joint record three times.Mc Caw predominantly played in the openside flanker position for the New Zealand, Crusaders and Canterbury teams, but also played as a blindside flanker and no. During Mc Caw's career, Canterbury won the NPC (later ITM Cup) five times, and the Crusaders won four Super Rugby titles.In 2004 he was appointed captain of the All Blacks, whom he led at the 2007 World Cup.After their elimination in the quarter-finals, his captaincy came under criticism, but he was retained and eventually led the team to consecutive world cup titles in 20, becoming one of only twenty players who have won two rugby union world cups.His debut for New Zealand was against Ireland, where he was awarded man-of-the-match.Mc Caw became a regular selection for New Zealand, only missing a few games due to recurring concussions.