Chelsea have agreed a fee with Spanish club Valencia to sign Juan Mata for a reported £23.5m.
The Stamford Bridge club said the deal was subject to the winger, 23, agreeing personal terms and passing a medical.
No fee has been officially disclosed but reports in Spain suggest the Blues are paying £23.5m.
"An agreement has been reached with Valencia CF for the transfer of midfielder Juan Manuel Mata," a statement on the Chelsea website said.
"The move is now subject to the player passing a medical and agreeing personal terms."
Valencia had confirmed the deal themselves earlier on Sunday.
After Chelsea's 2-1 win over West Brom, boss Andre Villas-Boas said: "He can add to any squad in the world."
Mata has been at Valencia since 2007 and as captain helped Spain win the Under-21 European Championship in the summer. He was also part of Spain's 2010 World Cup winning squad.
Villas-Boas has previously spoken of the need to recruit more midfielders and the club have also made bids for Tottenham's Luka Modric.
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