Blues are keen to add more home-grown players to their squad for next season.
Chelsea have been told to double their offer of £5 million if they want to sign highly rated Norwich City goalkeeper John Ruddy this summer, according to exclusive reports in the Sun.
The England international has been at Carrow Road for the past three seasons now, having originally signed for the Cannaries from Everton in July 2010.
And in the intervening three-year period, the 26-year-old has proved himself to be one of the most consistent and reliable shot stoppers in the country, keeping 19 clean sheets in his 93 matches in all competitions for Norwich in that time.
As a result, Ruddy received his first England call-up from manager Roy Hodgson for a friendly against Italy in Switzerland last autumn, although new Blues head coach Jose Mourinho will now need to lodge a new bid of £10m if he still wishes to bring the keeper to Stamford Bridge when the summer transfer window reopens for action on July 1.