Niang, 20, moved to Milan from Caen in August 2012 for £2.5 million, but has since struggled to break into the Rossoneri’s first-team, making just three appearances this season for a total of 28 minutes.
The Frenchman has since been linked with a move to St James’ Park this month, but talks are said to be stalling over the terms of the deal.
Newcastle are reported to want a loan with a right of purchase for Niang, who is understood to prefer a switch to England over fellow chasers Torino and Udinese, but Milan would rather keep the promising front man’s long-term future tied down to the San Siro.
However, according to calciomercato.it, a deal could be worked out if Santon is used as a makeweight to bridge the gap between the two sides, with the pair moving in opposite directions on permanent deals.
The Italian full-back made his first-team comeback in the FA Cup defeat at Leicester on the weekend after being sidelined since August with a knee problem, but it remains to be seen whether he will be able to earn back his starting spot moving forward.
Considering Niang was reported to be have attracted interest from both Arsenal and Chelsea prior to moving to Milan, as well as Newcastle’s need for another goalscorer, a potential deal could well make sense for the Toon, but negotiations are sure to be far from straightforward.