The attacking midfielder has been strongly linked with a move to the Blues and his current manager says he wouldn't stand in the Brazilian's way.
Chelsea has been handed a boost in the pursuit of Shakhtar Donetsk star Alex Teixeira after the Ukraine club's manager Mircea Lucescu revealed he wouldn't stop the player from leaving.
The 26-year-old - who joined the club from Vasco Da Gama in 2010 - has been persistently linked with a move to Stamford Bridge after scoring 22 league goals in just 15 games so far this season.