Chelsea boss Andre Villas-Boas insists he won't sacrifice defence for improving their attack.
Luka Modric and Alvaro Pereira are the Blues' two other main targets, all of which could add up to a more expansive game being played under Villas-Boas.
But the new manager insisted that would not come at the expense of the defensive solidity for which Chelsea have become renowned.
"It's not by bringing in extra forwards or forward-thinking players that you become more offensive," he said.
"Maybe in the end you are punished at the other end and you could become exposed defensively if you do.
"You just have to create a balance."