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There has been no contact between the clubs as yet, but Barcelona coach Tata Martino is said to be interested in bringing 23-year-old Villarreal defender Mateo Musacchio to Camp Nou.
Chelsea winger Kevin De Bruyne's agents have met with Bayer Leverkusen officials over a January move with the Belgian having been frozen out at Stamford Bridge.
Critical comments from reporters about the team have made Gerardo Martino feel doubt about his stay at Barcelona beyond the summer.
Stoke City, Hamburg and some MLS clubs are said to be interested in signing former Bayern Munich striker Ivica Olic, whose contract with Wolfsburg runs out in 2014.
West Brom have approached sacked Tottenham manager Andre Villas-Boas over the vacant managerial post at the Hawthorns following the departure of Steve Clarke.
Lazio tried to sign Juventus' Fabio Quagliarella last summer but with no success. The Biancocelesti are preparing another bid for January, with Giorgios Samaras and Graziano Pelle also said to be on their wishlist.
The Spartak Moscow winger is expected to return to Britain after falling out with the management of the Russian side, with Everton said to be keen.
Borussia Dortmund are rumoured to be looking at Hertha's Adrian Ramos and Hoffenheim's Kevin Volland as potential replacements for Robert Lewandowski.
Ajax coach Frank de Boer will not leave the Dutch club for Tottenham Hotspur despite reported interest from the EPL club. The Dutchman is said to be happy to remain in Amsterdam for several years to come.
Former Valencia playmaker Pablo Aimar, who is currently plying his trade in Malaysia, has been linked - not for the first time - with a move to Mexican side Club America.