This man who played for the Samoan U-20 national team and was willing to go to court to play for the Republic of Ireland in 2002, wrote his name in Australia's history when he scored the nations first World Cup finals goal in Germany 2006.
Tiny Tim, as he is affectionately called by the Everton faithful, will shoulder Australia's hopes in their second successive finals appearance in South Africa.
Despite his average height, Cahill is very strong and good in the air. Combined with his excellent passing skills and swift runs, he makes for an excellent attacking midfielder.
Cahill, who began his professional career with Millwall, played his first international game in 2004 and went on to become a key figure in Pim Verbeek's squad.
The 30-year-old scored four crucial goals in Australia's qualifying campaign, and his teammates will be looking to him again to provide some match-deciding goals in South Africa.
''I'm expecting to be a marked man, it's just about me being a bit more cute,'' he said.