Speaking to the former France star, the Chilean said he has realised just how big a club Manchester United are after joining from Arsenal in January.
"I think that Manchester United, since I was young - and I'm not just saying this because I'm here, I'm an honest guy and I never lie - I think it's the biggest club in England. That's what I think," Sanchez said.
"There are lots of big clubs, and having played for Arsenal, they are also one of them. It's a huge club and I was there. But coming here, looking at the badge, I think United have to win everything because it's such a big club. The club crest says it all."
After failing in the summer, Manchester City looked to sign him in January, but United are understood to have provided Sanchez with a better offer and he eventually linked up with Jose Mourinho's men on January 22, with Henrikh Mkhitaryan going the other way.
And Sanchez has now been given the chance to explain the reasons behind his move, with trophies in his sights. "I came here to win [things]. I left Arsenal because I wanted to develop and learn as a player, and get to experience a new club."
"Manchester United are a huge club on the global stage. I came here to win everything. Otherwise I wouldn't have come here."