Chelsea have had a £20 million bid rejected by Everton for defender John Stones, according to Sky sources.
The Blues have been long-term admirers of the England international, who has been capped four times and played in England's dismal European Under-21 Championship campaign earlier this summer.
Stones has played 44 league games for the Toffees after moving to Goodison Park from Barnsley in 2013, scoring just one goal in a 3-0 home win over Manchester United in April.
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The 21-year old signed a new five-year contract in August 2014 and has played a key role in defence for Roberto Martinez's side.
Able to pay as a centre-back or right-back, Stones received his first senior international call up for the friendly against Peru in a World Cup warm-up 3-0 win.
It remains to be seen whether Chelsea will submit a higher offer or turn their attention to another target.
If Stones does end up moving to Chelsea it could pave the way for Filipe Luis to return to Atletico Madrid. Reports have suggested that the Brazilian left-back was unhappy at being left on the bench for the majority of last season having been overlooked by Jose Mourinho who preferred Spaniard Cesar Azpilicueta.
John Stones is on a pre-season tour with Everton who are currently competing in the Barclays Asia Trophy in Singapore. They will face Arsenal in the final having beaten Stoke City on penalties after a 0-0 draw. The Gunners defeated a Singapore Select XI 4-0 in the other semi-final.
Meanwhile, Chelsea have begun their pre-season training in Montreal ahead of their International Champions Cup fixtures in North America against the New York Red Bulls, PSG and Barcelona before a final fixture back in the UK at home to Fiorentina.