Gittens completing an international transfer means five per cent of the fee paid by Chelsea, or £2.4m, is distributed as a solidarity payment to those clubs with a hand in his development up to the age of 23. The catch here is Gittens is still only 20, so Dortmund also retain a majority of that sum.

The former Borussia Dortmund winger could retain the only shirt number he has ever worn during his club career.

Chelsea has completed the signing of English winger Jamie Gittens from Borussia Dortmund for a reported initial fee of 48.5 million pounds ($66 million)