Several World Cup stars, who were on vacation, are heading back to the pre-season session as managers of top European clubs are looking to find the balance in their squads.
With two weeks left before the transfer market closes, several negotiations are on for top talent.
Other players are seeking assurances about their future.
Here is all you need to know.
As per reports, Anthony Martial has told Jose Mourinho that he wants to leave Manchester United and the club is open to this idea.
But before Jose allows the player to part ways, he is looking to close a deal for Inter Milan star Ivan Perisic.
United were interested in the 29-year-old last season too, but Inter didn't budge.
Manchester United left-back Luke Shaw is determined to earn a place in the starting XI and wants a new deal with the club.
The player stated that he wants to show Mourinho his qualities and feels he can be a pivotal player for the side in the upcoming season.
Shaw will be fighting for a place against make-shift defender Ashley Young.
The speculation regarding Alex Iwobi is set to come to an end with the player agreeing to a new deal with the club.
Manager Unai Emery stated that the player is about to sign a new deal and continue his stint with the Gunners.
Meanwhile, Petr Cech wants to fight for his place and is determined to fulfill his contract at Arsenal.
Everton mid-fielder Davy Klaassen has joined Werder Bremen after just one season at the club.
Chelsea will target goalie Jordan Pickford, if Thibaut Courtois leaves for Real Madrid.
The Blues are keen to acquire £40mn-worth defender Daniele Rugani from Juventus.
Jefferson Lerma of Spanish club Levante has handed in a transfer request after Bournemouth's bid was rejected.
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