Mikel Arteta has told Arsenal fans that the full extent of David Luiz’s injury will be known within 48 hours.
The Brazilian was hauled off five minutes into the second half against Leicester and replaced by Shkodran Mustafi.
The problem appeared to be a muscle injury, which could prove pivotal at such an important stage of the season.
Games are coming thick and fast for Arsenal and Luiz had discovered a decent patch of form, building a partnership up with summer signing Gabriel Magalhaes.
The Gunners went on to lose against Leicester at the Emirates after Jamie Vardy came off the bench to net the winner.
The Englishman has dealt heartbreak to Arsenal fans over the years, scoring 11 times against them in his career.