The 26-year-old has moved from McLaren to Maranello as replacement for four-times world champion Sebastian Vettel alongside Charles Leclerc, who returned to the cockpit on Tuesday after recovering from COVID-19.
CARLOS IN A BEANIE ⛄️ #essereFerrari 🔴 https://t.co/gLKuSsnYAt
— Scuderia Ferrari (@ScuderiaFerrari) 1611757382000
Leclerc completed more than 100 laps in the 2018 car in his stint, practising starts and work for the new season starting in Bahrain on March 28.
Ferrari are carrying out five days of testing with race drivers and Academy youngsters, including F2 champion Mick Schumacher who will be racing for the U.S.-owned Haas team this season.
Official pre-season testing is limited to three days in Bahrain in March but teams can do private running in cars that are more than two years old.