That is according to The Chronicle, who claim the Magpies are keen on the 22-year-old as they look for a striker with a proven track record in the Championship.
The Blues youngster enjoyed two successful loan spells at Middlesbrough and Derby from 2013 to 2015, scoring a combined 25 goals in England's second-tier.
Controversial Leeds owner Massimo Cellino is said to have watched the 20-year-old in the League One play-off final last month, in which he scored the opening goal.
And now the Elland Road side are keen to sign Fletcher, who has refused to rule out a return to Oakwell this summer, either on a loan or permanent deal.
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