#2 Wenger's over-reliance on Ozil and Sanchez plays into Mourinho's hands

Wenger's over-reliance on Alexis Sanchez and Mesut Ozil has cost Arsenal on many occasions over the last few years. Since 2014/15, Sanchez and Ozil have contributed to 53.4% of Arsenal’s goals.
But in the 2017/18 season, Ozil and Sanchez have combined to score only 4 times and have provided a total of 5 assists, showcasing why Arsenal are struggling to break down opponents. The pair is yet to hit their peak this season, and Mourinho will try to exploit the weakness.
Jose Mourinho is an expert at man marking the opponent's best players, especially if the team depends on one or two to win the game. He used Ander Hererra effectively to mark Eden Hazard out of the game against Chelsea, last year, and he did the same to Phillipe Coutinho last month.
Wenger's over-reliance on his star duo will certainly play into the hands of Mourinho, and Wenger may find it difficult to outwit him.