The post of vice-chairman, which existed since WADA's creation in 1999, was never filled because national governments could not agree on a name.
Aroundtherings.com reports that Pound, who has headed the agency since its inception, will step down at the end of his three-year term.
Mikkelsen will be up for re-election in one year.
WADA also approved a 7.5 per cent increase in its 2005 budget, said Pound at a press conference in Montreal Sunday. The agency will have $21.7million to spend next year in its battle against doping.
The organisation is funded in equal parts by national governments and by the Olympic movement.
