Sanchez kept a clean sheet as Chelsea won their Carabao Cup tie 1-0.
He later said: "It feels better, much better, by multiples of ten.
"I knew I was going to end up somewhere playing. I came here one hundred percent convinced because it was going to be my final decision.
"I am happy with the team, happy with the coach, he has a lot of confidence in me and now I have to do my best."