He made his debut at the 1977 Monaco Grand Prix with the Shadow racing team sponsored by Italian businessman Franco Ambrosio, replacing Renzo Zorzi. He took his first point at the Japanese Grand Prix later that year. Later that year team-leader Jackie Oliver and sponsor Ambrosio left Shadow to form the Arrows team. Patrese and Shadow teammate Alan Jones both received offers from the Williams team for 1978: whilst Jones joined Williams, Patrese linked up with Arrows, alongside Rolf Stommelen. Shadow subsequently took Arrows to court, arguing that Arrows had stolen the design of the Shadow DN9 that Arrows and were essentially running a DN9 under a different name. The court agreed, forcing Arrows to design and construct a totally new car, the Arrows A1, which became the first of the Arrows F1 bloodline.