Getty Images SportNathan EdwardsIs Jurrien Timber injured again? Mikel Arteta provides update on defender after substitution in Brighton drawJ. TimberArsenalBrightonPremier LeagueMikel Arteta has explained why Jurrien Timber was substituted against Brighton amid fears the defender sustained another injury.Article continues belowArticle continues belowArticle continues belowArticle continues belowTimber seen holding hamstring in Arsenal's drawDutchman missed most of last season through injuryDefender had to be replaced by Zinchenko