Arsenal were on Sunday beaten 2-1 by Bournemouth in the Premier league.
Wing-back, Hector Bellerin put the Gunners ahead early in the second half.
Calum Wilsonand and Jordon Ibe scored in a space of four minutes for Bournemouth to turn the game around in the second half at the Dean Court Stadium.
The result means the Gunners remain sixth on the table, five points behind Tottenham.
Wenger started with a three man defense of Rob Holding, Calum Chambers and Mustafi but they were hardly ever troubled by the Cherries.
Arsenal were the better team in the first half in which clear cut chances were few.