And the news may present a dilemma for Mike Ashley and Alan Pardew. For a club that has been lambasted for its sale of Yohan Cabaye, the idea of selling another of their top performers surely wouldn't appeal.
At the same time, though, Newcastle United have profited from selling to Liverpool before - namely through the £35 million sale of Andy Carroll.
Any funds they would receive from a Sissoko sale, meanwhile, could prove crucial in their hunt for a new striker, with the club not yet having added to the lone signing of Ayoze Perez up front - although Siem de Jong can deputise as a forward.
So should Ashley and co. consider selling the 24-year-old, or will it be a backwards step in what has so far proven a very forward-thinking transfer window?
|Team||Pos||Goals||Assists||Dribbles Won||Passing Accuracy (%)||Tackles Won||Interceptions Won||Apps||Mins|
|Hatem Ben Arfa||Newcastle||MF||3||3||67||84.48||7||7||27||1,303|
Consulting the stats, it could be difficult for the club to part with the France international. Sissoko registered more assists than any other Newcastle midfielder last term, while he won an impressive 73 dribbles and also scored three times.
Sissoko also won 51 tackles, only bettered by Cheick Tiote of the Magpies' regular midfield men, though his passing accuracy was the lowest out of the above five.
The key, then, is whether Pardew considers the Frenchman indispensable or not.
With De Jong having moved to St James' Park, Sissoko's exit could be accounted for by the goals and assists the Dutchman is likely to bring to Newcastle, while the club's negotiating position would strengthen in their bid for new strikers.
Ashley has already stood firm and missed out on the likes of Bafetimbi Gomis and Pierre-Michel Lasogga. But, with greater funds available, it could be a different story next time out.
On the other hand, though, Sissoko's contribution was a key one on Tyneside last term; and the Magpies might be seen as taking another step in the wrong direction should they let him go.