Spanish media outlet, El Confidencial, have reported Mendes has been recruited to complete the deal which is apparently very close.
Mendes boasts the likes of Jose Mourinho and Diego Costa as his clients and is one of the best in the business at pushing deals through.
The deal is close to being wrapped up but a fee has yet to be agreed and Madrid are holding out for around £43 million for their prized asset.
The 24-year-old Frenchman has netted an impressive 22 goals in 35 La Liga appearances this season and would provide cover for the injury prone Diego Costa and strengthen the Blues’ attacking options with his versatility.
Griezmann would be joining a fierce Chelsea attacking line which would arguably become the strongest in the Premier League for next season if they can secure the Frenchman’s services.
Will Antoine Griezmann sign for Chelsea this summer? Do they need him?