Chelsea are targeting Bayern Munich's Luiz Gustavo as a replacement for John Obi Mikel should the Nigerian, as expected, leave Stamford Bridge this summer.
Mikel, who only last season signed a new five-year contract, is resigned to leaving London now that Jose Mourinho is back in charge and has been persistently linked with a move to Turkey.
Now Mourinho is lining up Brazilian defensive midfielder Gustavo to take his place.
He would cost upwards of £16million and has two years remaining on his contract in Germany.
It may not prove an easy move, however - the 25-year-old, who played for Brazil in the Confederations Cup, has only recently claimed he is happy at Bayern with no plans to move.