The Germany international trio had been granted an extended summer break after winning the World Cup in Brazil but are now back with the team, though unavailable for Saturday
Joachim Low's side achieved glory in Brazil thanks to Mario Gotze's goal in extra time to beat Argentina in the final but all three Gunners stars played a part in the national team's run to triumph.
Look who's back! pic.twitter.com/ZNKDizKORr— Arsenal FC (@Arsenal) August 13, 2014
Granted a longer break by manager Arsene Wenger to recover from their summer exertions, the trio are now back in action, though the Frenchman has confirmed that none of them will play any part in the club's Premier League opener against Crystal Palace on Saturday.
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Mertesacker returns to the Emirates Stadium as the club's new vice-captain, with Mikel Arteta having been promoted into the armband following Thomas Vermaelen’s departure for Barcelona.
The Germany trio had been given longer to recover than some of their international team-mates, with Thomas Muller starting for Bayern Munich on the same day as their return in the DFL-Supercup against Borussia Dortmund.