Chelsea complete signing of Kai Havertz from Bayer Leverkusen

Kai Havertz has joined Chelsea (Sascha Schuermann/PA)

Chelsea have announced the signing of Germany international Kai Havertz on a five-year contract.

The 21-year-old attacking midfielder has made the move to Stamford Bridge from Bayer Leverkusen for a fee that will rise to a maximum of £70million, the PA news agency understands.