Chelsea have signed Germany international forward Andre Schurrle from Bundesliga side Bayer Leverkusen for a fee of £18m, The BBC reports.

Schurrle, who becomes manager Jose Mourinho's first signing since returning to the club, has signed a five-year deal.

"It is an honour for me to play for this club, with this team and for these great fans," Schurrle said.

The 22-year-old scored 11 goals in 34 league games for Leverkusen in 2012-13.