Barcelona defender Dani Alves has refused to comment on speculation regarding his long-term future, despite interest from Manchester United and Chelsea, reports Sky Sports.

The Brazil international is widely regarded as one of the greatest full-backs in world football, and after impressing at Camp Nou over the past five years, has a growing list of admirers.

Blues boss Jose Mourinho is understood to be keen to bring Alves to Stamford Bridge, but would have to pay a hefty price given that he's under contract at Barcelona until 2015.

Manchester United are also believed to be monitoring the 30-year-old's situation in Spain, and could lodge a rival bid for the player's signature, as David Moyes looks to strengthen his squad at Old Trafford.

However, despite continuous rumours about his future, Alves insists he remains happy in La Liga, and pays little attention to transfer talk linking him with a Barcelona exit.

"My future always appears in the papers," he told El Mundo Deportivo. "But I live day to day and year to year.

"It is a pleasure that the big European clubs are interested in my work but for now, I am very happy here, I am very clear."

Alves boasts a wealth of experience, and remains an important member of Gerardo Martino's first-team squad, having won four Spanish league titles and two Champions League triumphs since signing from Sevilla in 2008.

"If I sign a deal, I fulfil the contract as long as the two parties are happy," he added.

"Today, I say that Barcelona are content with my work and they are positive, as am I."

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Barcelona
Manchester United
Chelsea
Football