Chelsea have accepted an offer from Valencia for defender Asier del Horno.
They have not revealed any details of the fee involved, but Del Horno travelled to Spain to discuss the deal with the Primera Liga club.
Del Horno, 25, joined the Premiership champions from Athletic Bilbao for £8million last summer but struggled to hold down a regular place in Jose Mourinho's side.
The imminent sale of Del Horno could prompt Chelsea to move for another left-back.
They continue to be linked with Arsenal and England's Ashley Cole, with reports stating he could complete a £16million move across the capital as early as next week.
Mourinho has refused to comment on speculation linking the Barclays Premiership champions with a move for the 25-year-old, instead highlighting the return of a rejuvenated Wayne Bridge from his loan spell at Fulham.
'Ashley Cole is an Arsenal player. It's not correct to say anything about him,' Mourinho said yesterday.
'We have Wayne Bridge back. His spirit at Fulham was good and it was a good move for him and for us.'
Regarding the situation involving Del Horno, Mourinho added at yesterday's press conference: 'If we sell him we will have a space in our squad. Ashley Cole is a good player but we are being connected with every good left-back in Europe.'