Barcelona said it has reached an agreement in principle with Celtic on the transfer of Spanish midfielder Marc Crosas to the Scottish club.
It said the fee was 500,000 euros plus a further 900,000 euros depending on the players appearances, qualification for the Champions League and titles won.
Barcelona has an option to buy him back in the 2009/10 season for two million euros, it said in a statement on its website late Tuesday.
Crosas, 20, joined Barcelona when he was 13, and made his debut with the first team in December 2006.
In January 2008, he was loaned to French champions Lyon.