Tottenham Hotspur FC v Arsenal FC - Premier LeagueGetty Images Sport

Huge Bukayo Saka concern for Arsenal as Mikel Arteta admits he 'doesn't know' why star winger could not complete north London derby against Tottenham

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  • Saka complained of pain before substitution
  • Arteta unsure as to whether he's injured
  • Arsenal won 1-0 thanks to Gabriel header