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Ilkay Gundogan has undergone a knee operation ahead of a planned move to Manchester City.

The German international is one of Pep Guardiola’s top targets this summer - but a £17m move has been put in doubt after after he suffered a dislocated knee.

But Guardiola is still believed to be keen to push a deal through, while Borussia Dortmund are open to letting the 24-year-old go, if their valuation is met.

German newspaper Bild reported on Friday that Gungogan had opted to undergo surgery on the injury, which means he will miss this summer’s Euros.

It is estimated it will take four to six months for him to make a full recovery.

Should he return to fitness at the earliest possible date, it means he would be available for the opening weeks of next season.

Watch: Manchester City summer targets

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That would explain why Guardiola has not been put off in his pursuit of one of Europe’s top midfield enforcers.

City director of football Txiki Begiristain has already held talks with Gundogan’s agent as he gets to work on Guardiola’s list of targets.

The incoming manager has also identified midfielders Paul Pogba, Toni Kroos as players he’d like to overhaul his midfield - while he admires Bayern Munich’s Thiago Alcantara.

Yaya Toure is expected to leave the Etihad this summer after his agent claimed City are prepared to sell the Ivorian.