With the Premier League's transfer window closing on Thursday, the top title contenders have completed their squad building until January.

Liverpool have been the winners in the summer transfer window, landing Brazil’s No.1 goalkeeper and also acquiring the services of Naby Keita while Tottenham have failed to bring in any new faces as the window closed on Thursday.

Here we take a look at how the top six Premier League Club from last season stand before the season starts.

Manchester City

After sweeping to the title with a record 100 points and more wins and goals than any previous team in the Premier League era, it was tough for Manchester City boss Pep Guardiola to improve his stylish side. Guardiola opted for only one significant new recruit, landing Algeria winger Riyad Mahrez from Leicester in a £60 million swoop. Mahrez bolsters City's already impressive array of attacking talent and, while Guardiola missed out on Italy midfielder Jorginho, who instead joined Chelsea, the champions' combination of youthful swagger and world-class talent still makes them favourites to reign supreme again at the end of the season.

In: Riyad Mahrez Leicester, £60m; Claudio Gomes PSG, free; Philippe Sandler PEC Zwolle, £2.6m; Daniel Arzani Melbourne City, undisclosed.

Out: Angus Gunn Southampton, £10m; Pablo Maffeo Stuttgart, £8.1m; Angeliño PSV, £5m; Joe Hart Burnley, £3.5m; Bersant Celina Swansea, £3m; Olarenwaju Kayode Shakhtar Donetsk, £2.6m.

Manchester United

Jose Mourinho made an early splash as he spent £52 million on Shakhtar Donetsk's Brazil midfielder Fred and a further £19 million on Porto defender Diogo Dalot, but the Manchester United manager was still underwhelmed by his club's business. Mourinho spent much of United's pre-season tour of the United States grumbling about the lack of depth in his squad and reportedly feuding with executive vice-chairman Ed Woodward over failed approaches for defenders Harry Maguire, Yerry Mina and Toby Alderweireld. After finishing second last season -- 19 points behind City -- United look no closer to bridging the gap to their hated rivals.

In: Fred Shakhtar Donetsk, £43.7m; Diogo Dalot Porto, £19m; Lee Grant Stoke, £1.5m.

Out: Daley Blind Ajax, £14.2m; Sam Johnstone West Brom, £6.5m; Joe Riley Bradford, undisclosed; Timothy Fosu-Mensah Fulham, loan; Cameron Borthwick-Jackson Scunthorpe, loan; Dean Henderson Sheff Utd, loan; Joel Pereira Vitória Setúbal, loan; Axel Tuanzebe Aston Villa, loan.

Tottenham

Mauricio Pochettino had challenged his club to be "brave and take risks" when asked what Tottenham needed to do to improve their squad following their third-place finish last season. Fast forward three months and the north Londoners are under-fire from their fans after failing to make a single signing. Pochettino is adamant Tottenham's lack of transfer activity isn't a problem because it was just as important to hold onto the club's key players. Harry Kane, Christian Eriksen, Son Heung-min and Kieran Trippier have all signed new contracts since May. "I am not worried, I am not sad, I am so happy. To keep our best players was our objective and we have achieved that," Pochettino said.

In: None

Out: Keenan Bennetts Borussia Mönchengladbach, £2m; Anton Walkes Portsmouth, undisclosed; Reo Griffiths Lyon, undisclosed

Liverpool

Determined to build on a fine season that saw his team finish as Champions League runners-up and take fourth place in the Premier League, Reds boss Jurgen Klopp embarked on a £160-million spending spree. Klopp landed Roma goalkeeper Alisson Becker for £66 million and paid £52 million for RB Leipzig midfielder Naby Keita. Not content with those eye-catching deals, Klopp added midfielder Fabinho from Monaco for £39 million and landed Stoke playmaker Xherdan Shaqiri in an £18-million move. Having knocked City out of the Champions League last season, while also beating them in domestic action, Liverpool are expected to mount a strong challenge for the title as they look to end their 29-year wait to be crowned kings of English football.

In: Alisson Roma, £65m; Naby Keïta RB Leipzig, £52.8m; Fabinho Monaco, £40m; Xherdan Shaqiri Stoke City, £13m.

Out: Danny Ward Leicester, £12.5m; Yan Dhanda Swansea, undisclosed; Emre Can Juventus, free; Jon Flanagan Rangers, free; Harry Wilson Derby, loan; Ben Woodburn Sheffield United, loan; Danny Ings Southampton, loan; Ryan Kent Rangers, loan; Ovie Ejaria Rangers, loan; Taiwo Awoniyi Gent, loan; Adam Bogdan Hibernian, loan.

Chelsea

Hired to replace the sacked Antonio Conte, Blues manager Maurizio Sarri insists he is happy to leave the wheeling and dealing to Chelsea's hierarchy -- a stark contrast to his predecessor's constant complaints about transfers. Jorginho was Chelsea's first close-season signing as the Italy midfielder followed Sarri from Napoli in a £57-million deal. Belgian goalkeeper Thibaut Courtois was allowed to join Real Madrid to be closer to his children, with Croatia midfielder Mateo Kovacic moving to Chelsea on a season-long loan as part of the deal. The £31-million fee for Courtois was immediately reinvested in Spain international Kepa Arrizabalaga, who arrived from Athletic Bilbao for £72.1 million -- a world record for a keeper. Crucially, Chelsea have so far staved off interest from Real and Barcelona in Eden Hazard and Willian.

In: Kepa Arrizabalaga Athletic Bilbao, £71.6m; Rob Green free; Jorginho Napoli, £50.4m; Mateo Kovacic Real Madrid, loan.

Out: Thibaut Courtois Real Madrid, £35m; Jeremie Boga Sassuolo, £3.5m; Jonathan Panzo Monaco, und; Kenedy Newcastle, loan; Lewis Baker Leeds, loan; Eduardo Vitesse, loan; Trevoh Chalobah Ipswich, loan; Mason Mount Derby, loan; Jay Dasilva Bristol City, loan; Mario Pasalic Atalanta, loan; Todd Kane Hull City loan.

Arsenal

Heralding the start of a new era at Arsenal following Arsene Wenger's departure last season, Gunners manager Unai Emery has been given a host of new faces in a bid to end his club's decline. Wenger's 22-year reign ended with a wretched sixth-place finish and a second successive season without Champions League action has had a profound effect on Arsenal's recruitment, with star names now hard to come by. Former Paris Saint-Germain boss Emery appears willing to let chief scout Sven Mislintat, director of football Raul Sanllehi and chief executive Ivan Gazidis call the transfer shots and that trio have made a series of cut-price deals for Matteo Guendouzi, Bernd Leno, Lucas Torreira, Sokratis Papastathopoulos and Stephan Lichtsteiner.

In: Lucas Torreira Sampdoria, £26.5m; Bernd Leno Leverkusen, £19.2m; Sokratis Papastathopoulos Dortmund, £17.7m; Matteo Guendouzi Lorient, £8m; Stephan Lichtsteiner Juventus, free.

Out: Lucas Perez West Ham, £4m; Jeff Reine-Adelaïde Angers, £2.7m; Chuba Akpom PAOK, £900,000; Joao Virginia Everton, undisclosed; Jack Wilshere West Ham, free; Santi Cazorla Villarreal, free; Hugo Keto Brighton, free; Calum Chambers Fulham, loan; Takuma Asano Hannover, loan.