Arsenal lost Shkodran Mustafi to injury in the 2-1 FA Cup win over Bournemouth, during which several young players impressed Mikel Arteta.
Third-tier Portsmouth await Arsenal in the FA Cup fifth round after Mikel Arteta's side saw off Bournemouth on the road.
Arsenal have been linked with a number of transfers in and out of the club, but Mikel Arteta does not see Pierre-Emerick Aubameyang leaving.
Arsenal were down to 10 men for over an hour but still held Chelsea to a 2-2 draw in the pick of the Premier League action on Tuesday.
Sergio Aguero's late double looked to have given the champions three points, but a Fernandinho own goal denied Manchester City.
Liverpool host Manchester United in a big clash at Anfield, but you can claim bragging rights over your mates in our Opta-powered quiz.
Goalkeepers Pepe Reina and Asmir Begovic have moved on loans, with the former joining Aston Villa and the latter switching to AC Milan.
Tottenham and Chelsea both slipped up in the opening round of fixtures in 2020, while Aston Villa climbed out of the relegation zone.
A 2-1 home loss to Leicester City proved to be Manuel Pellegrini's last game in charge of West Ham, while Manchester United beat Burnley.
Carlo Ancelotti and Mikel Arteta got their Everton and Arsenal tenures under way as Liverpool continued their march towards the title.