Raymond Koned Kalla Nkongo , known as Kalla, is a Cameroonian former professional footballer who played as a central defender. His main asset was a powerful physique.

Born in Douala, on the 22 April 1975, kalla started professionally at Canon Sportif de Yaoundé, he went on to play in four countries: first Panachaiki F.C. in Greece then Spain’s CF Extremadura, where he competed in both major divisions, he equally signed with VfL Bochum in Germany where he scored five times in his last season. Subsequently, Kalla joined Turkish side Sivasspor for the 2005–2006 campaign. Returning home for two final years at Union the Douala and retiring at the age of 33.

Kalla won 63 cups for Cameroon, and was a participant at three consecutive FIFA World Cups: 1994, 1998 and 2002. In the first he wast just 19years and played all the matches often being partnered by another youngest Rigobert Song (17). He was part of the victorious 2000 and 2002 African Cup of Nations squads.

After the 2002 World Cup, Kalla announced to retire from the national team due to conflicts with the Federation structure, which he accused of poor organization,but eventually changed his mind.

Initially summoned for the 2006 Africa Cup of Nations, Kalla was forced to withdraw due to injury and retired for the second and definitive time.

On February 28th,2022, Kalla is appointed as the new team manager of the Cameroon national team.