Goals from Granit Xhaka and Mesut Ozil sealed a 2-1 win over Arsenal, who have registered nine points from their opening five Premier League games. Newcastle United meanwhile are without a win this season.
The Uruguay worldwide is still waiting to make his first Premier League start under new manager Unai Emery at The Emirates.
Emery also praised Lucas Torreira for giving his team the "balance" it needed after coming on as a half-time substitute.
Signing another player from Arsenal in January, therefore, would not be the best PR. Mustafi, in particular, made a couple of errors, which could have proved costly.
The fifth round of premier league took place over the weekend and there were lots of goals scored in the matches by some teams while some struggle to win their matches because of lack of goals by forwards..
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Newcastle were still unable to create anything of note at the other end of the pitch, and Arsenal only grew in confidence with a last-ditch block being required to prevent Henrikh Mkhitaryan from finding the far bottom corner. Both Matt Ritchie and Ayoze Perez failed to make a difference while Jacob Murphy also lacked support from his teammates.
Arsenal needs to work on their offence as they are still not able to score too many goals and are often intense situation due to their bad returns in front of goals.
Fellow midfielder Aaron Ramsey looked far from his best, however, and was taken off near the end - with Emery saying he was tired after playing "too much" with Wales during the global break.
How to read this, a third successive victory for Arsenal - their second away from home - by September was best done through context.
The Arsenal fans will hope that they can keep up their momentum in the upcoming matches as they aim for a solid recovery after a stuttering start to the season.