The 2020 24 Hours of Portimo had a total of 15 cars to join the event including the Porsche 911 GT3 R of Herberth Motorsport and the Mercedes-AMG GT3 of the Winward Motorsport.
A total of fifteen cars were entered for the event; 9 GT and 6 TCE cars. Porsche 911 GT3 R (2019) HTP Winward Motorsport Mercedes-AMG GT3 (2019) 
