The former England international has repeatedly been linked with a St James' Park switch in recent months, having fallen out of favour at Tottenham.
Mersone wrote in his Daily Star column: "Newcastle should go to football's equivalent of the dog rescue centre and pluck themselves a pedigree January signing.
"Dele Alli might not be just for Christmas, he might not even be there much after May if The Geordies do take the drop.
"But, for me, he's definitely worth a punt and could prove to be an inspired acquisition.
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