Preheat the oven to 180C/160C Fan/Gas 4. Heat the oil in a large, lidded, heatproof pan or paella pan. Fry the chicken until the pieces are evenly browned, turning them regularly as they cook.
Add chicken and sausage slices to skillet; cook, stirring occasionally, until lightly browned, about 5 min. Stir in rice and 3 cups water. Bring to a boil; reduce heat to medium-low.