The 40-year-old free agent will travel to Chile to undergo a medical before being officially unveiled at the Estadio Monumental, Mosa told reporters ahead of Colo-Colo's league match against Deportes Limache.
"Vozinha will be a Colo Colo player. In the coming days he will travel to Chile, undergo the usual medical examinations and then be presented here at the Estadio Monumental," Mosa said.
Mosa added Vozinha's World Cup performances showed he deserved the move, while acknowledging the signing also carried marketing appeal for the Chilean side.
Although the deal has yet to be finalised, Colo-Colo teased the signing on social media with an image appearing to show the veteran goalkeeper's trademark curly hair.
Vozinha, who left Portuguese second-tier side Chaves before the World Cup, was voted into FIFA's fan-selected World Cup dream team after helping tournament debutants Cape Verde hold eventual champions Spain to a goalless draw and pushing eventual runners-up Argentina into extra time in the last 32.