The France international has a deal to 2023 and new contract talks with Bayern have stalled.
Sky Deutschland says Coman is demanding €20m-a-year to stay, while Bayern's last offer was worth €15m-a-year.
And watching developments is United, along with Real and Barca.
Coman has recently stated: "I would like to finish the season and show my best level. We will see what happens in the future. We have spoken with the club and we will see if there are any news. I have always had the intention of playing for a great club and Bayern is one of the the greatest."
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