He's deceptively quick for such a big man, and there's no escaping the power and physicality he brings to a team which has, in recent years, been a bit too easy to bully.
Gunners boss Arsene Wenger has made it clear that Sanchez will not be sold, however, and has instead informed him that he will run down his contract before allowing him to leave on a free next summer.
"We had the intensity in the games in our preparation that is needed to be ready", said Wenger.
"Alexis will not be available", he said when asked about team news ahead of the visit of the Foxes.
"I just think we are not open - what I said to you many times - to any offers, anyway", Wenger told a press conference at Arsenal's London Colney base.
"I'm personally convinced that will happen soon", Wenger was quoted as saying by espnfc in a Football Writers' Association Live event to raise money for victims of the Grenfell Tower fire disaster. "I think if you read the French papers, they are on (Kylian) Mbappe's case to finish their transfer market".
As well as Sanchez, Wenger could be without a number of other key players for the season-opener and had fitness concerns over Mesut Ozil, Aaron Ramsey, Shkodran Mustafi and Per Mertesacker.
With plenty of time until deadline day, The Grapevine has the very latest football transfer news from the Premier League's top clubs in our round-up below.
"I want the team to be on a par with the club's history, which is something I've been lucky enough to feel at every club - there was the same kind of feeling at Inter [Milan] and at Real Madrid".