I think we've found our first legitimate Chelsea transfer rumour of the winter. Besiktas president Fikrit Orman has, apparently, been openly talking about bringing some of our players to Turkey on loan:
We have a very good relationship with them. Will we do business with them in January? Why not? We are interested in some of their players, but not Petr Cech. We want to get loans for the second half of the season. It is very difficult to invest in players at the same time as building the stadium. We do not have stadium income.
The Turkish football world is notorious for fake quotes, so take this with the grains of salt it requires, but the Independent are reporting it so I don't think we have to be too concerned that these are wholly imaginary. Later, the Indy article mentions that Mr. Orman mentioned Salah by name. Which, of course, makes total sense -- if Besiktas are going to be taking our first-teamers on loan, Salah is the perfect fit.
He's not getting much playing time for Chelsea, sits in our deepest position (Schurrle and Willian are already busy battling it out for playing time, and Jose Mourinho hasn't exactly been averse to using Ramires out wide when he's healthy either), and could help Besiktas out a great deal. The article also mentions Nathan Ake, which seems less likely due to our lack of cover for midfield and the defence.
Might this happen? It's as likely as any rumour I've heard so far this season. So, sure, keep an eye out.