Arsenal centre-back Gabriel Magalhães will be sidelined for at least a month, sources have told ESPN on Wednesday.

The Brazil international pulled a muscle in his thigh in the second half of his country's friendly with Senegal on Saturday.

His injury is still being assessed by the Gunners' medical staff but the first diagnosis is a four-week absence. It could be longer too if the injury doesn't scar as quickly as anticipated.

It is a massive blow for Mikel Arteta and his team as Gabriel, 27, has been exceptional defensively and offensively so far this season, starting every Premier League and Champions League match so far.

Arsenal have kept the most clean sheets so far this season in the Premier League (seven and 11 games) and have the best defence too with five goals conceded i

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