Prost to be steward as Monaco takes shape
It is the four time world champion and former team owner's second appearance in the role, after kicking off the FIA's driver representative era in Bahrain last year.
Prost, now 55, is one of the most successful drivers in F1 history; his 51 wins bettered only by Michael Schumacher's 91.
He dominated in Monaco between 1984 and 1986, and also won in 1998 when his arch-nemesis Ayrton Senna crashed at Portier whilst easily leading.
It also emerged in Monte Carlo on Wednesday that the FIA has installed "higher curbs and speed bumps" to stop drivers from short-cutting the chicanes at the tunnel exit and the Swimming Pool.
At the same time, teams were struggling to get their motorhomes up and running after being delayed by the Ste-Devote fire.