Various news sources in France, most notably Eurosport, are reporting that Paris Saint-Germain and Newcastle are in advanced talks regarding the signing of French midfielder Moussa Sissoko. This on it's face does not appear Tottenham Hotspur related. However, due to the UEFA Financial Fair Play restraints on PSG, the French champions must sell before bring in any new players. There are several likely candidates for sale, but the ones currently generating the most buzz are Thiago Motta and Adrien Rabiot.
While the Rabiot deal has often been presented as simply a season-long loan, the addition of Sissoko may further motivate Rabiot (and his mother/agent) to seek a permanent move away from the Parc des Princes. Meanwhile, Thiago Motta's agent has denied the rumors of a move, which came from Italian journalist, and Cartilage Free Captain favorite Gianluca Di Marzio.
Another possible solution, but one that is probably just the usual English tabloid press making things up, is Yohan Cabaye moving to Newcastle in a part-swap deal. I can't imagine Mike Ashley, Newcastle's owner, stumping up the wages to bring Cabaye back, though the Mirror reckons NUFC can pay Cabaye off with a portion of the cash received for Sissoko. Where that cash will come from remains to be seen.
In short, PSG are in a weird position. They need to sell some players before bringing in any new signings. However, some of their most desirable assets, like Rabiot, still may have a bright future in Paris and the club is loathe to part with them. If PSG are going to sign Sissoko, something needs to budge, whether that's Cabaye, Motta, or Rabiot. Of the three, Rabiot seems to be attracting the most attention and I wouldn't put it past Tottenham's management to make a small, but decent offer to make the move permanent.