who has now been taken on by Toro Rosso.
Ferrari’s other 2018 development driver Antonio Giovinazzi has been picked up by Sauber.
Hartley has said he would like to stay involved in F1, though he has a lifeline at Porsche who are about to enter the Formula E electric car GP circuit.
He has also been tipped for another drive with Porsche at Le Mans where he won the famous race during his stint as an endurance driver with the German manufacturer.
Hartley would have to weigh up driving options against a backroom job at Ferrari, though the prestige of the Italian team