Romelu Lukaku, Alvaro Morata and this transfer window's most expensive Premier League signings [Photos]

Chelsea, Liverpool and Arsenal broke their transfer records during the 2017-18 summer transfer window as Premier League clubs continued to spend exorbitantly on the world's top football players.

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Manchester United signed Romelu Lukaku from Everton for £75 million making him this transfer window's most expensive buy. AP

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Alvaro Morata became Chelsea's most expensive signing when he signed for the Premier Leaue champions from Real Madrid for a reported £58 million. Image courtesy: Twitter/@AlvaroMorata

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Benjamin Mendy became the world's most expensive defender when he left AS Monaco to join Manchester City for £52 million. Image courtesy: Twitter/@ManCity

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Kyle Walker left Tottenham Hotspur to join rivals Manchester City for £50 million. Image couretsy: Twitter/@kylewalker2

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Arsene Wenger forked out £46 million for Lyon's Alexandre Lacazette making him the Arsenal's most expensive signing. Image courtesy: arsenal.com

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Manchester City snapped up Portugal's Bernardo Silva before the transfer window opened from AS Monaco for £43.6 million. Image courtesy: Twitter/@ManCityES

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Tiemoue Bakayoko traded Ligue 1 champions AS Monaco for Premier League champions Chelsea in a deal which saw the Blues pay Monaco £39.7 million. Image courtesy: Twitter/@ChelseaFC

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Mohammed Salah became Liverpool's most expensive signing in their history when the Merseysiders paid AS Roma £36.9 million for the services of the Egyptian winger. Image courtesy: Twitter/@LFC

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Manchester City signed goalkeeper Ederson from Benfica for £34.9 million making him the second-most expensive keeper in the history after Juventus' Gianluigi Buffon. AP

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Victor Lindelof left Portuguese champions Benfica for Manchester United for £31 million. Image courtesy: Twitter/@ManUtd