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Has one of Manchester United's sponsors let slip news about the Reds latest signing?

Bwin, United's 'official online gaming and betting partner' tweeted on Wednesday a message welcoming Ilkay Gundogan to Old Trafford.

It was deleted moments later, but not before it caused a stir among United fans on Twitter.

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The German midfielder is set to leave Borussia Dortmund this summer after declining the chance to extend his contract.

The 24-year-old has been linked with moves to United, Barcelona and Bayern Munich but earlier this month said he had not yet made a decision about where he will play next season.

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Click through the gallery to see United's transfer targets in pictures.