Former Netherlands midfielder Johan Neeskens, considered one of the best midfielders of his generation, has died aged 73.

Neeskens, who worked as a coach with the Socceroos’ 2006 World Cup team, fell ill while working in Algeria. The cause of death has not been revealed.

The Royal Dutch Football Association (KNVB), on whose WorldCoaches project he was in Africa on behalf of, confirmed his death on Monday.

Know the news with the 7NEWS app: Download today

“The world not only says goodbye to a gifted sportsman but above all, to a compassionate, driven and wonderful person,” the KNVB said.

Neeskens was part of the Dutch sides that lost the 1974 and 1978 World Cup finals and in 2004 was named one of the 125 Greatest Living Footballers by FIFA. He won 49 caps for his country.

A former box-to-box midfielder who was renowned for his stamina, grit and skill, Neeskens spent the majority of his playing career at Ajax Amsterdam, where he won the European Cup three seasons in a row between 1971-73, and at Barcelona, at both clubs alongside compatriot Johan Cruyff.

After retirement he was an assistant coach for the Dutch national team at the 1998 World Cup as they finished fourth, and later worked under Frank Rijkaard at Barcelona.

In between he worked under Guus Hiddink alongside Graham Arnold during Australia’s 2006 World Cup campaign.

Football Australia described Neeskens as a “beloved figure” and “true icon” who left “an indelible mark” on the Socceroos.

“Johan Neeskens was a true footballing legend, not only for his exploits on the field but for the influence he had as a coach,” chairman Anter Isaac said.

“His contribution to the Socceroos’ success at the 2006 World Cup was immense, and his ability to connect with players and staff alike made him a valued and respected figure within our national team.

“His passing is a great loss for the football world, we are deeply saddened, and our thoughts are with his family, friends, and everyone whose lives he touched.”

The Socceroos are currently in camp ahead of World Cup qualifiers against China in Adelaide on Thursday and Japan in Saitama next Tuesday.

Neeskens also had a spell as head coach at South African club Mamelodi Sundowns, which was his final role in professional football and ended in 2012.

Prominent commentator Simon Hill said: “Vale Johan Neeskens, No.2 to Guus Hiddink in 2006. Incredible footballer, and gentle guy, who loved Australia, partly because he could walk unrecognised here…unlike most places in the world. RIP.”