This summer has seen the completion of some mammoth deals.
Neymar sealed a world record £199million move to Paris Saint-Germain, Ousmane Dembele moved from Borussia Dortmund to Barcelona in a £97m deal and Romelu Lukaku got a dream transfer to Manchester United for £75m.
And with the transfer window slamming shut on Thursday evening there's still plenty of action to come.
Below are seven huge transfers - two of which over £100m - that could very well happen before Friday...
Diego Costa
Current club: Chelsea
Club linked with: Atletico Madrid
Estimated fee: £30m
Diego Costa has been vying for a move to Atletico Madrid all summer, and the Spaniard may finally get his wish.
The striker wouldn't be able to play for La Liga club till January, but a £30m transfer with a surprising loan to Everton could take place.
Kylian Mbappe
Current club: Monaco
Club linked with: Paris Saint-Germain
Estimated fee: Loan with view to £166m transfer
This summer's most sought after target could finally have his future settled by Thursday midnight. After months of Arsenal and Real Madrid speculation, it appears the teenager's future lies with fellow Ligue 1 side PSG. But in order to swerve FFP rules, the forward may move on loan prior to sealing a permanent switch.
Alexis Sanchez
Current club: Arsenal
Club linked with: Manchester City
Estimated fee: £70m
It seemed that this summer's Sanchez saga was over, but then Liverpool thumped Arsenal 4-0. Manchester City remain front runners for the Chilean, and recently had a £50m offer turned down.
Time is against Pep Guardiola's side but a £70m offer may get the deal over the line.
Thomas Lemar
Current club: Monaco
Club linked with: Liverpool/Arsenal
Estimated fee: £60m
Arsene Wenger was desperate to capture Lemar's signature this summer, but after a bid in the region of £44.7m was rejected any talk of a move died.
However, Liverpool have emerged as late contenders for the
Monaco have stated the player is not for sale, but can a late bid from either side sway the Ligue 1 champions?
Philippe Coutinho
Current club: Liverpool
Club linked with: Barcelona
Estimated fee: £125m
Following Neymar's world-record departure to PSG, Coutinho became Barcelona's number one target.
However, three rejected bids and the arrival of Ousmane Dembele has caused Barcelona to go quiet on the move.
Both player and club still want the transfer, but Liverpool continue to stand in their way.
Virgil van Dijk
Current club: Southampton
Club linked with: Chelsea/Liverpool/Arsenal
Estimated fee: £70m
The wantaway Saints defender handed in a transfer request after being exiled from the first team squad.
Liverpool were desperate for the centre-back with Chelsea also interested in capturing the Dutchman's services. More recently, Arsenal have entered the race to sign the defender.
Van Dijk will do everything he can to get a move, but will his wish be granted before Friday?
Riyad Mahrez
Current club: Leicester City
Club linked with: Arsenal/Chelsea/Manchester United/Roma
Estimated fee: £40m
It is not sure exactly where Riyad Mahrez is heading, but the winger is definitely going somwhere.
The 26-year-old has been granted permission to leave the Algeria squad to "formalise" a move, according to the Algerian Football Federation.
The Foxes previously turned down three bids from Roma for Mahrez, with the last offer in the region of £32million.
Serie A seems the most likely destination for the Algerian, but Arsenal may make a late desperate bid if Sanchez does indeed go.