It is understood there has been contact between the two clubs over the 18-year-old midfielder, who is out of contract at the end of the season.
No talks over a new deal have so far taken place and should no offer materialise, he would be able to leave the club on a free transfer, although United would be entitled to compensation of around £300,000.
However, it is understood the Magpies' interest is yet to go any further than that initial enquiry.
Wythenshawe-born Morrison has three senior United appearances to his name, all of them in the Carling Cup.
But while hugely talented, he has had his problems off the field and last season pleaded guilty to two charges of witness intimidation.