Chelsea boss Jose Mourinho has hit out at his title rivals, accusing them of trying to 'buy the title'.
Manchester City have pulled off the single biggest deal of the window so far by landing Raheem Sterling from Liverpool for around £49 million. Manchester United meanwhile have spent in excess of £80 million on four players as they look to challenge for the league crown once more.
Liverpool have also been busy in the transfer market following the departure of Sterling and have completed seven deals already - including big-money moves for Christian Benteke and Roberto Firmino from Hoffenheim.
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Mourinho's arrival at Chelsea back in 2004 after Roman Abramovich purchased the west London club in 2004 heralded the start of a major spending spree which helped the Special One deliver two Premier League titles.
However the former Real Madrid boss has accused the likes of Manchester City and Manchester United of using their money to buy their way to the top.
He said: "In the beginning of Mr Abramovich coming to Chelsea, Chelsea was buying the title. Now, they are buying the title. All of them, they are buying the title.
"It is up to us to be strong and to fight them and, obviously, to try and win it again, even without the big investments."
So far Chelsea have only made two moves in the transfer window, bringing in Radamel Falcao on loan, while Asmir Begovic has been signed to act as back-up to Thibaut Courtois next season.
Petr Cech has left the Blues in order to join Arsenal, while rumours continue to persist that Loic Remy could be sold. If that does happen then Mourinho would likely move for a replacement, while Everton defender John Stones has already been the subject of a £20 million offer.