By Anthony Ashworth

The Japanese international, 23, has previously admitted meeting with Sir Alex Ferguson, and now sources in Germany are claiming United have submitted a formal offer for Kagawa.

Shinji Kagawa 'close to £12million Manchester United transfer'

Dortmund sporting director Michael Zorc suggested there was substance behind the reports, stating: ‘Some details are still to be confirmed.’

Kicker suggests that the two sides are close to agreeing an initial £12million fee, potentially rising to £17.5million with add-ons.

The playmaker has scored 17 goals this season in all competitions to help Dortmund secure a second consecutive Bundesliga title and claim the domestic double.

Kagawa still has a year to run on his contract, but has made no secret of his desire to eventually switch to the Premier League, and his teammate Mats Hummels believes the former Cerezo Osaka man will leave.

‘Shinji is a world class player, but honestly, I don’t expect him to stay with us. Otherwise, he would have extended his contract by now,’ defender Hummels told German daily Bild.

‘I hope he makes the right decision and thinks about that. I wish him all the best.’