The Swiss midfielder joined Arsenal for over £30 million on Wednesday.
The Borussia Moenchengladbach captain became the Gunners first signing of the summer in a deal worth upwards of £30 million on Wednesday.
The 23-year-old has developed a reputation as one of the brightest stars in European football outside of a traditional major club over the past few years through his consistently impressive displays for the German side.
Xhaka departs Moenchengladbach having scored nine goals in 140 appearances across four years, and he should add aggression and steel to the Arsenal midfield next season.
The Swiss international revealed that he potentially could have been bolstering the Gunners title challenge even earlier, as Wenger first got in touch with him to scope out his interest in a move 12 months ago.
Xhaka told Blick: "He [Wenger] is a legend for me. Today, he is allowed to train me. When was the first contact? A year ago, I was almost speechless when he called."
The midfielder has become known in Germany as a tough tackler and ball-winner with the ability to spread the play once in possession, and Gunners fans will be pleased to have such a developing talent added to their midfield ranks, particularly as their options had dwindled with the upcoming exits of veteran Mikel Arteta and Tomas Rosicky.