Atletico Madrid goalkeeper Jan Oblak has rejected the chance to join Chelsea following an approach from the Premier League club.
Chelsea are attempting to find a replacement for Thibaut Courtois, who has missed training for the last two days in an apparent attempt to force through a move to Real Madrid before Thursdays transfer deadline.
Chelsea are prepared to sell Courtois to Madrid for £35 million but will only approve the transfer once a replacement is signed.
Oblak is top of Chelseas goalkeeper shortlist and the club are willing to pay the 25-year-olds £89m release clause.
But according to Bilbao-based newspaper El Correo, Oblak turned down Chelsea after initial contact was made by the club.
As a result, Chelsea have now turned to Athletic Bilbao goalkeeper Kepa Arrizabalaga.
The 23-year-old, who rejected a move to Real Madrid in January, would represent a slightly cheaper option for Chelsea due to his £71m buyout clause.
Bilbao are unwilling to negotiate over a fee for Kepa and have told Chelsea that his release clause must be met.
Reports in Spain have claimed that Chelsea are willing to pay Kepas £71m fee on Wednesday and are hopeful that the goalkeeper can be signed in time for him to begin training with Maurizio Sarri on Thursday.
Kepa was part of Spains 23-man squad for the World Cup but did not feature in Russia, although fans had called on him to start ahead of David De Gea after the 3-3 draw against Portugal in their Group B opener.
More: Chelsea FC