Liverpool and Chelsea have been put on red alert over a future swoop for Marco Reus as Borussia Dortmund's CEO admitted they cannot hold the midfielder back.
However, a serious injury means he is unlikely to leave before the February deadline, meaning the Premier League duo must battle it out next summer for Reus' services.
The German sportswear company will manufacture United's shirts next season and, because they also sponsor Messi, they could help pay for the Argentine's swap to Old Trafford.
The 20-year-old centre-back has a £32m release clause in his contract but Louis van Gaal is not prepared to exceed the £25m already offered for his signature.
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Lionel Messi is an Adidas athlete
The Gunners are in desperate need of a defender this January and appear most likely to land the player.
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