Manchester City have confirmed the signing of Ilkay Gundogan from Borussia Dortmund.

The midfielder becomes the first signing under new boss Pep Guardiola - despite being out with a dislocated knee.

The deal was announced in slightly bizarre style on Twitter, with the player tweeting "ANNOUNCE GUNDOGAN" to City.

The club's account then responded with "Sounds like a plan... Let's do it!"

The 25-year-old has penned a four-year deal at the Etihad and declared himself delighted to have made the move to the Premier League.

“I’m thrilled to have signed for Manchester City,” said Gundogan. “When I learned of City’s interest my heart was set on coming here and things have moved very quickly.

“I have loved my time with Borussia Dortmund and I would like to thank the club and the supporters for the five very happy years I spent there.

“They gave me a platform to play on and I became a better player because of the belief, patience and trust they showed in me.