Arsenal visit London rivals West Ham on Saturday, desperate to make up ground on the sides above them on the Premier League table. Here's everything you need to know ahead of the match.

West Ham have had a much poorer start to their season, with Julen Lopetegui ’s side languishing in 14th, just three points above the relegation places. And with matches against fellow strugglers Leicester and Wolves coming up – as well as a match at home to Arsenal up next – the Hammers desperately need a win as they head into one of the most congested periods in the fixture list in December.