Ocon replaces German Nico Hulkenberg in the line - up alongside Mexican Sergio Perez at a team currently fourth in the constructors ' championship .
German Nico Hulkenberg has moved to Renault .
Ocon replaces German Nico Hulkenberg , who has moved to Renault , in the line - up alongside Mexican Sergio Perez at a team currently fourth in the constructors ' championship .