Chelsea have signed Brazil defender David Luiz from Benfica in a five-and-a-half-year deal worth about £21.3m.

The package, which is believed to include an initial fee of about £18m, also sees midfielder Nemanja Matic move from The Blues to Benfica.

Luiz, 23, arrived at Chelsea's training base on Monday evening to complete his medical, with Benfica confirming the deal late on Monday night.

His performances earned him a call-up to the Brazil squad last summer.

Source: BBC Sport