Done deals - Europe's most expensive transfers: Neymar, Dembele, Lukaku,
The transfer window is well underway, but here are the biggest deals (over £30m) you may have missed from around Europe so far. And check back for updates.
For a full breakdown of all transfers in Europe's major leagues, sortable by club, please click here.
Note: All fees are undisclosed and based on ESPN FC sources unless noted with *.
Well, this one came out of almost nowhere less than a month ago and one of Barcelona's star players has now moved for a new world record. It's the biggest transfer this window. This biggest transfer in history. Though Barcelona now have £198m to spend on new talent.
It's been on the cards for some time, and the money is not yet in Monaco's accounts as it won't be a permanent deal until next summer, but Mbappe has moved to PSG on loan to avoid FFP issues, before becoming the second highest transfer in the world.
After a few weeks of negotiations, Barcelona were able to snap up a replacement for Neymar for the mere price of €105m, rising to €147m with bonuses. Dembele, 20, is now the second-most expensive player of all time, with the winger even beating Paul Pogba's £89.3m move to Man United last season.
Lukaku was linked with a move back to Chelsea but chose Manchester United instead and is now a teammate of his friend Paul Pogba. Reports suggest the final price with add-ons could be a new world-record of £90m. Wayne Rooney went the other way in a separate deal.
Morata scored 15 goals in 26 appearances for Real Madrid in La Liga last season but wanted a chance to become undisputed first-choice. Antonio Conte gave him that chance.
Mendy impressed with Monaco last season and will now have to deal with the pressure of being the world's most expensive defender at Man City.
He almost moved to Atletico Madrid but due to their transfer ban, Lacazette arrived at Arsenal from Lyon this summer instead.
City have been on the lookout for full-backs and made Spurs' right-back Walker the joint-most expensive defender in history for a fee that will reach £50m with add-ons.
The Iceland international signed a five-year contract, with big-spending Everton laying out a club-record fee for a midfielder they had been chasing for some time.
Portugal international Silva won Ligue 1 with Monaco last season and caught the eye of Pep Guardiola, who snapped him up in June before any other major clubs had done business.
A reliable, selfless performer in defensive midfield, the Serbia international reunites with his former manager at Chelsea as Man United seek to win their first Premier League title since 2012-13.
Another starlet from Monaco's Ligue 1 winning side, Bakayoko chose to line up alongside N'Golo Kante in a fearsome looking midfield at Chelsea.
Arsenal lost another English player to a rival, and Liverpool got a young, hungry midfielder. The key was his contract ending in 2018 and desire to play in central midfield, something Jurgen Klopp offered over Chelsea.
It is a transfer that rocked Italy as Milan kept up their spending spree by stealing one of Juventus' best players. Instead of heading off to Chelsea, Bonucci chose to stay in Serie A.
Sanchez became the club's first signing of the summer, and the most expensive in Tottenham history, breaking the £30m record set by Erik Lamela and Moussa Sissoko. And the defender's price tag could rise to €42m (£38.4m) with add-ons, depending on his appearances and success.
Remembered by many for his failures at Tottenham, the Brazil midfielder was reborn in China and made the move to Barcelona to add some squad depth to a flagging team.
With another €15m in add-ons to come, Bayern have secured their future with the signing of the 22-year-old midfielder.
The English premium was at its best on deadline day as Chelsea bought themselves a new midfielder, and a familiar one to star player N'Golo Kante. Will the duo be able to do what they did at Leicester though?
After the forward said he would not renew his contract, Juventus snapped him up. He may not oust Gonzalo Higuain or Paulo Dybala but it's a good get.
With Joe Hart farmed out on loan and Claudio Bravo not trusted, Pep Guardiola spent a record fee for a goalkeeper on the 23-year-old Brazilian stopper. He could be No. 1.
Salah did not impress too much during his spell at Chelsea a few years back, but Liverpool will hope he can overcome his past.
The Roma defender made it clear it was Antonio Conte that persuaded him to move to the Premier League and the 24-year-old has plenty of time to develop his game.
AC Milan continued their summer of spending by adding the 21-year-old forward to their strikeforce. Big things are expected.
Atletico Madrid are under a transfer ban until January 2018 but signed the Spain winger and immediately loaned him out to Las Palmas.
The Sweden international was linked with a move to Old Trafford for almost six months and finally completed the deal in June as Jose Mourinho got his first signing of the summer.
Follow @ESPNFC on Twitter to keep up with the latest football updates.