Real Madrid's hopes of signing Courtois hinge on Chelsea's ability to find a replacement of similar calibre before the Premier League transfer window closes next Thursday. "In the next week we have a friendly match again".
The futures of Courtois and Hazard are more uncertain.
Defender Cesar Azpilicueta also offered his views to the club's official website, explaining that despite some early misfortune, he "trusts" his team-mates to deliver under the new boss.
Madrid have always been interested in the 26-year-old as they aim to find a new No.1 to replace Keylor Navas in their first-choice XI, having admitted defeat in their pursuit of Manchester United's David de Gea.
Speaking on Friday, new Blues manager Maurizio Sarri said he was unsure whether Courtois would stay.
"Chelsea wants for the best players to stay", Luiz said.
Two returning players, and two world class upgrades, IF he can keep them at Chelsea.
The duo had an excellent rapport while working together at Napoli, before they both left San Paolo at the end of last season.
The 59-year-old Italian's style has been likened to Pep Guardiola's.
They may be a club willing to play huge wages that will attract the game's best players, but committing your future to Chelsea can only be viewed as a risky option right now and Sarri is among making that discovery the hard way.