Barcelona are reportedly keen on signing Chelsea duo Branislav Ivanovic and David Luiz.
Barcelona have been monitoring Luiz for some time, while Real Madrid are also believed to be showing interest.
It was thought that the Catalans' interest had cooled as a result of the recent departure of Pep Guardiola, but reports in Spain last month suggested new coach Tito Vilanova is also keen on the Brazil international.
And according to El Mundo Deportivo, Barcelona are preparing to make their move to sign the centre-back.
Although he has agreed a deal for Valencia left-back Jordi Alba, Vilanova is keen on further strengthening his back four this summer and has been priced out of moves for AC Milan defender Thiago Silva and Athletic Bilbao's Javi Martinez, while Borussia Dortmund centre-back Mats Hummels has also ruled out a move to Spain.
The new Barca boss is also said to be keen on signing Ivanovic, who has also been linked with a move to Madrid, although it is highly unlikely the Blues would be prepared to let him leave Stamford Bridge.
And whether Ivanovic would even be tempted by a move to Camp Nou is unclear, especially as his chances of getting regular first-team football next season have increased as a result of the recent departure of Jose Bosingwa, who was released by the club last month.
Speaking earlier this month, Barca spokesperson Toni Freixa gave little away about the club's defensive transfer targets after being linked with a move for Silva.
"Do not take it for granted that our priority is Thiago Silva, who is, however, a great player," he told Marca.
"The news has come out and I don't want to discuss the sources, but, in any case, I do not want to either confirm or deny [it].
"I cannot confirm interest in one player or another, because we're not at that point yet."