Cadena Ser says the Argentina international is set to move to the Vicente Calderon with the two clubs having already settled on a fee during negotiations over Diego Forlan's move to Atletico last month.
Riquelme's Atletico deal is for two years with the option of a third. The contract is worth £3.5 million-a-year - a cool £1.5 million-a-year less than what he was on at Villarreal.