Any move could be smoothed over by the so-called 'super-agent' Jorge Mendes, who looks after Ronaldo's interests and has also secured moves to Stamford Bridge for Diego Costa, Radamel Falcao and Filipe Luis in recent seasons.
Mazinho moved his family to Spain in 1994 after securing a move to Valencia, and when Rafinha turned 13, he was enrolled in Barcelona's youth system, where he joined his brother Thiago — now a senior player at the club.
The German club eventually agreed to let their striker move to Stoke in a reported £6m deal, but Ba failed a medical, according to the Potters, before eventually securing a move to West Ham later that month.
Emerton started out with Sydney Olympic before securing a move to Feyenoord in 2000.
He has since continued to flourish at Fenerbahce, before securing a move to Valencia this week.
"We would all like to congratulate Duncan on securing a move to Sunderland," he added.
Nigeria striker Brown Ideye says he has achieved a "dream" by securing a move to the Premier League with West Brom.
The player was recently released by the Ospreys regional rugby team after securing a move to French club Bayonne.
Arsenal striker Nicklas Bendtner, 24, has confirmed he is in talks with a number of clubs about securing a move away from Emirates Stadium.
Vazquez came through the ranks at Espanyol before securing a move to Getafe last summer and was a team-mate of Swans defender Jordi Amat for club and country.
Duffy started his career in the SPL with Rangers before securing a move to Falkirk and became their top scorer in the 2004/05 season.
