Barcelona have the option to re-sign Chelsea midfielder Oriol Romeu until the summer of 2013, Mundo Deportivo claims.
The Spain Under-21 international joined the Premier League side in the summer in a deal worth £4.2 million, and has since broken into Andre Villas-Boas' starting XI, with 12 appearances to date in all competitions.
Villas-Boas denied on Monday that Barcelona have the ability to re-sign the midfielder for a pre-arranged fee, stating that the transfer would always have to meet Chelsea's approval.
However, Mundo Deportivo cites Barcelona sources, who insist that Romeu's contract contains a £8.4m buy-back clause after 2011-12, and a similar £12.6m clause at the end of the following season.
This means that Chelsea's only chance of holding on to Romeu - if Barca want to re-sign the 20-year-old - is if the midfielder snubs a return to Camp Nou, where he made just one official appearance at senior level.
Starting last month and continuing every Friday through to January, Goal.com will publish extracts from Graham Hunter's highly-anticipated book, Barca: The Making of the Greatest Team in the World. The most recent extract detailed how Jose Mourinho's Real Madrid have closed the gap on Barca following a period of Catalan dominance.