Nick Miller looks at five key talking points regarding Sunday's clash between Arsenal and Chelsea at Emirates Stadium.
1. Will Arsene Wenger finally beat Jose Mourinho?
It seems implausible that Arsene Wenger has never beaten a particular rival over so many encounters, even if that other manager is one as successful as Jose Mourinho. Wenger's head-to-head record with Mourinho reads P12, W0, D5, L7, F6, A21, which is not exactly impressive and would seem to back up Mourinho's perceived dig on Friday...
Arsenal defender Per Mertesacker is doubtful for Sunday's match against Barclays Premier League leaders Chelsea because of an ankle injury.
Gabriel Paulista is ready to come at centre-half, while goalkeeper David Ospina and full-backs Hector Bellerin and Nacho Monreal are expected to return having sat out last weekend's FA Cup semi-final against Reading at Wembley.
Captain Mikel Arteta (ankle) and midfielder Alex Oxlade-Chamberlain (groin) are still not match fit.