Felipe Nasr
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Felipe Nasr, currently not racing in Formula One, was actually a reserve driver for Williams in 2014. Williams reportedly were happy with Nasr's performance and feedback and it was even rumoured that he would take up Massa's seat alongside Bottas in 2017 before Stroll was announced.
Nasr has been out in the cold for a year now and it is unlikely yet possible that Williams will call upon his services for 2018. The Brazilian is rumoured to be in the mix but his lack of experience in the current format goes against him and that is why Nasr has only a slim chance of taking up the seat at Williams Martini Racing in 2018.
Edited by Musab Abid