How they spend: Chelsea v Arsenal
Jose Mourinho has claimed Arsenal are "more than ready to be title contenders" after spending heavily in the transfer market.
Here is a comparison between the spending of Mourinho's Chelsea and Arsene Wenger's Arsenal over the last two years.
2013/14: Andre Schurrle £18million, Marco van Ginkel £8million, Cristian Cuevas £1.7million, Willian £32million, Isiah Brown £209,000*, Christian Atsu £3.5million, Nemanja Matic £21million, Mohamed Salah £11million, Kurt Zouma £12.5million.
2014/15: Cesc Fabregas £30million, Diego Costa £32million, Mario Pasalic £3million*, Felipe Luis £15.8million, Loic Remy £8.5million, Juan Cuadrado £23.3million.
2015/16: Asmir Begovic £8million, Nathan £4.5million*, Danilo Pantic £1.25million*.
2013/14: Mesut Ozil £42.5million, Matt Macey £100,000*.
2014/15: Alexis Sanchez £35million, Mathieu Debuchy £12million, David Ospina £3million, Calum Chambers £16million, Danny Welbeck £16million, Krystian Bielik £2.4million, Gabriel Paulista £11.2million.
2015/16: Petr Cech £10million.