"I promise I will contribute positively with the team," he told Arsenal media.
And Elneny is optimistic about the club's chances of winning every trophy available to them this season after developing a taste for silverware in Switzerland. During three years in Basel, the 23-year-old won three league titles and hopes pace-setters Arsenal will still be on top in May.
"I am hoping that we win the Premier League and cup this season," he added. "And the Champions League as well, God willing."
"It is my honour to be trained under his management."