United have long had interest in Kingsley Coman.
He was eyed by the Red Devils as an alternative to Jadon Sancho two years ago, only for neither player to end up arriving.
Bayern, like many other top teams in Europe, have downplayed interest in Ronaldo as the uncertainty over his Old Trafford future grows.
But if they did register their interest in the 37-year-old after the departure of Robert Lewandowski, then Erik ten Hag’s side may choose to request Coman in return.
As a versatile forward capable of playing across the front three, that’s something that could make Coman appealing for the fallen Premier League giants.
Marcel Sabitzer, too, is another potential player who United would be interested in.
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