The manager was full of praise for the Chilean following his hattrick against Leicester on Saturday.
The Chilean was the star of the show in the Gunners’ 5-2 victory at the Kingpower Stadium on Saturday, scoring a hattrick to guide his team to a victory that looks more comfortable than it was.
It was a much needed return to form for the forward, who had so far struggled to impress again following a busy summer winning the Copa America with his national side.
And Wenger believes his star man is now back to his level.
“He is back to his level. He won a big competition with Chile - the Copa America,” he told arsenal.com.
“I think as well mentally to adjust to the game on a mental level takes some time. I could see in training a different player in the last week or two and he has shown that today. I believe going forward he always looked dangerous.”
Is Sanchez world class?
And when it comes to answering whether Sanchez is world class as many believe, Wenger had no qualms in saying he believes his star man is.
It has been a big debate whether there are truly any world-class players left in the Premier League, with a number of stars from that bracket such as Luis Suarez and Gareth Bale, having swapped it for La Liga in recent seasons.
There are some big stars left in the division though, with Sanchez and Chelsea’s Eden Hazard among them, and Wenger says he believes the Chilean is world class, but he has plenty of others who are too.
“I think so. I think I have plenty of players that are world class,” he added.
“You have to understand the definition of that but overall he is a striker who is mobile and works hard for the team. When the team plays well he can score goals.”