Chelsea prepared to use Courtois to close Falcao deal
The 26-year-old Atletico Madrid striker is regarded as one of the hottest properties in European football after his exploits with the Spanish club.
He scored 36 goals for Atletico last season and helped them win the Europa League.
And he made Chelsea aware of his threat with a hat-trick against them as Atletico won the UEFA Supercup earlier this season.
Atletico may ask for him as part of any deal involving Falcao - with Courtois valued at £10m.