What rule change was introduced by FIFA following the match between Australia and American Samoa in 2001?

Context: On 11 April 2001, the Australian and American Samoan national association football teams played each other in an Oceanian qualifying match for the 2002 FIFA World Cup. The match was played at the International Sports Stadium in Coffs Harbour, Australia. Australia set a world record for the largest victory in an international football match, winning the game 31–0. Australia's Archie Thompson also broke the record for most goals scored by a player in an international match by scoring 13 goals. David Zdrilic, the scorer of eight goals in the match, scored the second-highest number of goals in an international match since World War I.

The outcome of the match led to debates about the format of qualification tournaments, with the Australian manager Frank Farina and Thompson feeling that preliminary rounds should be introduced to avoid such unbalanced matches, views shared by the international footballing body FIFA. It eventually led to the introduction of a preliminary round in the Oceanian zone qualification for the 2006 FIFA World Cup. The unbalanced level of opponents was also addressed by Australia's move to the Asian Football Confederation in 2006.

Answer: Preliminary rounds were introduced prior to the FIFA world cup matches