sentences:  Teo Fabi also missed the season ending Portuguese Grand Prix when he was racing the Champ Car race at Laguna Seca.Fabi was replaced in Portugal by Manfred Winkelhock who had raced the first 13 races of the season for the ATS team.The reason Brabham ended up with the Fabi brothers sharing the drive was reportedly due to the team's major sponsor, Italian dairy company Parmalat, wanting an Italian driver alongside Piquet.