The forward has been one of the Premier League’s standout performers since arriving at the north London club from Barcelona in the summer of 2014 and helping the Gunners win the FA Cup last season.
The 27-year-old is known for his direct and energetic style of play and looked sharp as he made his return from a hamstring injury during the 1-0 loss to Chelsea last weekend.
And Wenger has revealed how he first came to notice the Chile international before his transfer to Barcelona from Serie A side Udinese.
Wenger told Arsenal’s website: “It was playing for Udinese [that I first spotted him]. He was very dynamic, very direct and very straight to the point.
“He was one of these players where his energy and the intensity of his energy level hits you straight in the face.
“It is strange because he catches your eye with his energy and level of commitment he puts into everything he does and that is what remained with me.”
Sanchez will be hoping to feature and get more game time when Arsenal host Burnley in the fourth round of the FA Cup on Saturday afternoon.
Arsenal are currently third in the Premier League table.
MORE: The latest football news