Barcelona president Sandro Rosell has confirmed the club are looking to make one more signing before the transfer window closes as the Catalan giants continue to be linked with Liverpool's Daniel Agger.

The Danish international was heavily linked with a move to the Nou Camp last summer but resisted the efforts of the La Liga champions, signing a new contract with the Reds last October.

But Barcelona have reignited their interest in Agger who has been persistently linked with a move to the club by the Spanish press throughout the summer, speculation heightened by claims from the Guardian that the defender's agent had been contacted by an agent representing the Spanish giants.

Although no names were mentioned, club president Rosell addressed the issue of incoming transfer business at the World Congress of Barcelona supporters meeting, announcing: "Before August 31 I can say there will be a further addition to the team."

Following the arrival of Brazilian superstar Neymar at the beginning of the summer Barcelona have remained relatively quiet on the transfer front with much of the focus on potential exits from the club as Manchester United have pursued Cesc Fabregas.

But new manager Gerardo Martino will be mindful of the defensive frailties that troubled the club last season, with Gerard Pique and 35-year-old Carlos Puyol still the club's only established options at centre half, along with the versatile Javier Mascherano.

Barcelona's public pursuit of Paris Saint Germain defender Thiago Silva proved to be futile, leaving the club to ponder other options in the English Premier League.

Although Agger would appear to be a popular choice amongst the Spanish press Chelsea's David Luiz remains linked with a move to the Nou Camp. But the Blues' determination to hold onto the Brazilian, who has also been linked with a move to Bayern Munich this week, is likely to scupper any moves Barcelona make.

Liverpool can ill-afford to lose Agger, the most experienced head in Brendan Rodgers' defence, following the retirement of Jamie Carragher at the end of last season.

Rafa Benitez's renewed interest in Martin Skrtel coupled with Sebastien Coates' peripheral role in the squad last season could leave new arrival Kolo Toure as the club's only other established presence at centre-half along with Agger.