The likes of Romelu Lukaku, Alexandre Lacazette and Kyle Walker have already gone but there are still so many big money moves to be made in this transfer window.
Every day, Mirror Football will keep you abreast of the selected deals around with the most interest.
So, what’s on the agenda today?
1. Chelsea’s striker search
Diego Costa’s Chelsea career is over. The nail in the coffin appeared to come on Sunday evening when he was filmed wearing an Atletico Madrid shirt while partying, also appearing to aim a jibe in the direction of Antonio Conte.
But where will Chelsea turn now? They are without a big name goalscorer – but a wide selection of world class talent remain available.
Pierre-Emerick Aubemeyang’s Borussia Dortmund future is in doubt with the Gabon front man implying that he wants to move on.
Andrea Belotti remains with Torino but comes with a hefty price tag.
Alexis Sanchez wants Champions League football and Chelsea would be able to offer it.
Alvaro Morata is still available but again would have to come at a price.
But which one is right for Chelsea?
2. Riyad Mahrez
He wants to go to Barcelona but they are just not that into him.
He wants to go to Arsenal but Arsene Wenger would prefer Monaco’s Thomas Lemar.
Roma have stepped up with a £20million opening bid for the Leicester title winner which has been rejected.
They are expected to return and Mahrez right now is running out of options.