Olympque Marseille striker Iliman Ndiaye is eyeing a return to England in January.
Ndiaye left Sheffield United for OM in August, but is open to returning to England next month on-loan.
So far, he has started only eight times in Ligue 1, having joined OM for £20m.
The Sun says the Blades are watching their former striker's situation, but will face competition should Ndiaye make the move.
Crystal Palace and Everton are also watching developments closely.