Chelsea boss Maurizio Sarri is leading the charge to secure Richarison’s signature with Paris Saint-Germain, Atletico Madrid and AC Milan all watching the Brazilian star closely.
Everton face a battle to keep Richarlison, who joined the club from Watford for a reported £40million last summer.
Everton would demand double that fee if they are to part ways with the attacker.
The Brazil international was recalled by Everton for Saturday's trip to the Hornets, in which the home side battled to a 1-0 victory.
Richarlison joined Watford from Fluminense in 2017 and went on to score five goals and register five assists in the first half of the season, before failing to add to that tally in the remainder of the campaign.
This season, the 21-year-old has scored 11 goals in his 27 appearances, setting up two goals for his team-mates.