Chelsea run the risk of repeating costly errors they made with Mohammed Salah and Kevin De Bruyne if they do not give Kai Havertz time to flourish.
Salah and De Bruyne were deemed sub-standard when they were shipped out of Chelsea for a pittance, only to return as world-class players in Premier League winning sides for Liverpool and Manchester City.
And Chelsea manager Frank Lampard, who prepares to face De Bruyne and City on Sunday, will hand another chance to his £89million summer signing Havertz to prove his worth.