GettyJamie SpencerWorry for Arsenal as Gabriel Martinelli carried off injured after stellar showing in Sheffield United demolitionArsenalSheffield United vs ArsenalSheffield UnitedPremier LeagueG. MartinelliGabriel Martinelli had to be helped off the pitch in the second half of Arsenal's huge Premier League win at Bramall Lane.Article continues belowArticle continues belowArticle continues belowMartinelli injured against Sheffield UnitedWinger had scored and assistedArsenal to face Brentford on SaturdayArticle continues below