Tottenham Hotspur have been linked with the 20-year-old this year.
Everton need a young, talented centre-back to replace Phil Jagielka and the Toulouse player is perfect for them.
The 20-year-old has been a rock at the back for Toulouse in Ligue 1 with Tottenham Hotspur and Arsenal sniffing around.
West Ham United fans expect their side to make some high quality signings in the summer.
The French defender shone in a 0-0 draw with PSG.
Everton and Crystal Palace are scouting Issa Diop of Toulouse.