Reserves defender Mikel San Jose is to spend the 2009-10 season on loan at Spanish club Athletic Bilbao.
The Reds originally signed the 20-year-old from the La Liga side in the summer of 2007 and he now returns to San Mames in a bid to gain first-team experience.
San Jose figured heavily in Liverpool's pre-season preparations after starring for the reserves last campaign.
The centre-back helped lead Spain to UEFA U19 Championship glory in July 2007 and is currently part of the U21s setup.