Chelsea boss Andre Villas-Boas is keen to buy English.
The likes of Manchester City winger Adam Johnson, Bolton's Gary Cahill, Jack Rodwell of Everton and Birmingham's Scott Dann are being linked with the Blues.
But a Chelsea source admitted to The Sun: "It's a big problem for Andre. Unless he can get rid of some of the overseas players he is restricted in what he can do.
"It's why English players are commanding bigger fees than perhaps they are worth."
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