The winger recently returned from an injury lay-off in the loss to Chelsea.
The Chilean winger has been a huge hit at the Emirates since arriving from in the summer of 2014, with a number of impressive performances having made him one of the stars of the Premier League.
He was a star before his arrival in England though, with him having been a key player at both Udinese and Barcelona before his move to London.
It was Italy that Wenger first saw him star though, and says it was Sanchez’s energy levels that immediately hit him in the face.
“It was playing for Udinese [that I first spotted him],” he told arsenal.com.
“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.”
The Gunners will now be hoping that Sanchez can put that type of effort into helping them win the title at the end of the season.
He has been sorely missed from the side over the busy Christmas period, with the likes of Joel Campbell having done well but struggled to replicate the quality he brings to the side.
He should now be fully fit after his break though, and Arsenal will be hopeful that much needed rest has got him back to his best as they eye the title come the close the close of the campaign.