transfer window after his Gunners contract was terminated - but it hasn't gone well so far.The Bundesliga's bottom side have shipped 13 goals in the five games the centre-back has played so far - including his hilarious own goal last weekend when he headed past his own keeper.That sent Schalke on their way to a 5-0 defeat - while they have also lost 5-1 to Stuttgart and 3-0 to RB Leipzig with Mustafi in the side.To be fair to the Arsenal defender, Schalke were walloped 4-0 by Borussia Dortmund when Mustafi was unavailable due to injury, and had already lost 13 games this season before he joined.And the 28-year-old has helped his new side keep two clean sheets - in goalless draws against Union Berlin and Mainz.Head coach Dimitros Grammozis.
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