Negotiations are likely to go down to the wire, as clubs seek the best possible deals. Here's a look at some of the high profile deals - some likely, some less so - that could happen before the transfer window closes.
5. Edinson Cavani - PSG
Manchester United and Chelsea both want him, but he doesn't seem to be too enamoured with a move to England. He looks most likely to go to Atletico Madrid at the moment. (Photo by FRANCK FIFE/AFP via Getty Images) Photo: FRANCK FIFE
6. Gareth Bale - Real Madrid
Surely not, surely not?! Well, stranger things have happened on Deadline Day. If it's anyone, it'll be Spurs who land him, but the odds of it happening aren't great at this stage. (Photo by Denis Doyle/Getty Images) Photo: Denis Doyle
7. Dries Mertens - Napoli
Available for a bargain £5 million, the Serie A goal machine could be the deal of the window should Chelsea see it through. However, there's likely to be a scramble for his services now his value is common knowledge. (Photo by Alessandro Sabattini/Getty Images) Photo: Alessandro Sabattini
8. Olivier Giroud - Chelsea
The striker domino effect is likely to kick off at some point today, and Chelsea's Olivier Giroud is one who's likely to topple into a new club. He could go to Lazio, Spurs, or even Newcastle United if reports are to be believed. (Photo by Alex Grimm/Getty Images) Photo: Alex Grimm