The Welsh international was to signing for Leeds 18 months ago but a transfer fell through.
James was then picked up by United the following summer.
The Wales international started quickly and well at United, but faded away badly as the campaign progressed.
Now a report in theDaily Starand other English sources claims James is a target for Leeds.
Boss Marcelo Bielsa wants to improve his attacking options, and United may be willing to loan or sell James if they add a forward in the transfer window themselves.