The 36-year-old Cech first joined Chelsea in the summer of 2004 from Rennes for £7m and having won the Premier League four times and the Champions League he moved to Arsenal in 2015 for £10m.
As Arsenal signed Bernd Leno Bayer 04 Leverkusen goalkeeper for £22.50m
Chelsea are considering re-signing goalkeeper Petr Cech if they sell Thibaut Courtois to Real Madrid, according to Sky sources.
They are also interested in Leicester City goalkeeper Kasper Schmeichel.
Reports in Belgian newspapers have suggested Real have offered €55m (£48.5m) and Sky Sports La Liga reported earlier on Tuesday Chelsea are willing to let him go.
Courtois has just a year left on his current deal and is prepared to run down his contract with Chelsea .
With Maurizio Sarri set to be unveiled as Chelsea’s head coach in his first press conference on Wednesday, it would seem the Italian is covering all bases regarding the goalkeeping position.