marc bartra
Marc Bartra (left) is expected to leave Barcelona at the end of the season. Getty Images

Barcelona may trade up to six first-team stars during the summer transfer window in order to fund squad improvements and secure the services of Neymar and Sergio Busquets with new mega-deals, according to Marca. Marc Bartra, Dani Alves, Adriano, Jeremy Mathieu, Thomas Vermaelen and one of the two main goalkeepers could follow in the boot steps of the likes of Cesc Fabregas and Pedro Rodriguez who in recent seasons exited the club to join Chelsea.

The La Liga giant have reputation for flashing the cash during the transfer window, with the likes of Neymar, Luis Suarez or Arda Turan being just the latest to make big-money moves to the Camp Nou. However, the Catalans aren't shy when it comes to selling big names either.

Pedro himself, Adama Traore, Gerard Deulofeu and Denis Suarez packed their bags to the Premier League during the last summer transfer window pumping £35m in to the Barcelona coffers, which was reinvested in the arrivals of former Atletico Madrid playmaker Arda Turan and ex-Sevilla star Aleix Vidal.

The same happened in 2014 when the likes of Fabregas, Alexis Sanchez and Bojan make the move to Chelsea, Arsenal and Stoke City respectively for around £60m, funding part of the huge overhaul worth around £120m which brought Suarez, Mathieu, Vermaelen, Ivan Rakitic, Marc Andre Ter-Stegen, Claudio Bravo and Douglas to the Champions League winners.

Marca claims that Barcelona will unveil a similar clear-out in order to get the cash to address other priorities. As a club chief recently confirmed, the "signing of the summer" would be pinning down Neymar's long-term future with a new deal and also keeping Busquets sweet with an eye-watering pay-rise.

Furthermore, Luis Enrique is said to be interested in bringing a top centre-back and a versatile forward to back-up the 'MSN' after the club failed to sign Nolito during the January transfer window due to their financial situation.

dani alves
Dani Alves has been linked with a  move to China Getty

Bartra's future at the club has been under scrutiny since last summer and recent reports in England suggest that Manchester United could be interested in securing his services for around £12m. Alves, signed a new deal last summer but is now 33-year-old and andthe latest big name to be linked with a move to China. Furthermore, he is one of the top earners in the squad and his position is well covered with Vidal, the versatile Sergi Roberto and, at a push, Douglas.

Barcelona, according to Marca, would be also listen to offers for Adriano, Mathieu and Vermaelen. The trio just served as back-ups for Luis Enrique and at least one of the centre-backs could be shown the door should they bolster the position further in the summer, amid rumours linking them with Aymeric Laporte, John Stones and Marquinhos.

The future of Bravo and Ter Stegen also looks uncertain amid reports suggesting that the German international is not happy with the rotation policy, with the Chilean has been restricted to the Copa del Rey and the Champions League. Luis Enrique is more than happy with both but Marca suggest that he "would not be able to stand in the way if either was keen to develop and move on."