Chelsea are making a push to sign Rayo Vallecano defender Pep Chavarria, a 28-year-old left back who has caught the eye in La Liga.
The signing is at the behest of Xabi Alonso, who has expressed interest in the player.
Chelsea's need for a new left back stems from the departure of Marc Cucurella to Real Madrid, and Chavarria is seen as a suitable replacement.
According to reports, Chelsea have already had an offer of around €15 million rejected, but are now set to submit a revised offer of around €25 million.
The player has reportedly agreed personal terms with Chelsea, and is eager to join one of the world's top clubs.
However, Rayo Vallecano may be hesitant to sell, particularly given the need to replace a key player and the time constraints of the transfer window.
It remains to be seen whether the two clubs can come to an agreement, with Chelsea reportedly accelerating their efforts to finalize the deal.
Rayo Vallecano will not want to hold onto Chavarria against his wishes, given the distraction he is reportedly feeling due to the interest from Chelsea.