Petr Cech
The only signing that Wenger ended up making this past summer, Cech has been solid for Arsenal so far. His showing against Bavarian giants Bayern Munich showed how good he really is and why his capture is as good as acquiring a striker.
He’s appeared ten times in the league, which is quite high and he has conceded just 1 goal in the past 4 games, with that one coming against Everton yesterday.
He’s kept the opposition at bay quite a few times and has shown consistency in doing the same. Resting him would make perfect sense.