Marcus Gronholm and co-driver Timo Rautiainen have signed two-year deals to compete for Ford in World Rally.
Gronholm won the world title in 2000 and 2002
The Finns, currently with Peugeot, will make their debut in January in Ford's brand new Focus RS.
Gronholm, 37, made his rally debut in 1989, has won 18 events and was world champion in 2000 and 2002.
"I believe Marcus and the all-new Focus RS WRC will be the perfect package. He will join the team at a hugely exciting time," said Ford boss Jost Capito.
"Ford has an incredible opportunity to reach the pinnacle of the sport and Marcus will play a vital role in our aim to win the world championship with the all-new Focus RS WRC."