Real Madrid have been hotly tipped to launch a mega swoop for the Blues No.1 next summer.
The Spanish giants had a transfer ban reduced last week by the Court of Arbitration for Sport.
And they will now be free to sign new players at the end of the season.
“Chelsea have lined up three goalkeepers to replace Thibaut Courtois”
Chelsea won’t want to lose Courtois, who is one of the world’s top goalkeepers.
But according to Corriere Dello Sport, the Premier League leaders have already drawn up a list of replacements.
Atletico Madrid’s Jan Oblak, AC Milan youngster Gigi Donnarumma and Borussia Moenchengladbach’s Yann Sommer are said to be the trio on their shopping list.
Oblak was signed by Atletico as Courtois’ replacement after he returned to London after three seasons on loan.
The Slovenian is reportedly the club’s No.1 target, with Donnarumma and Swiss keeper Sommer alternatives.