The Addicks finished ninth in the Championship a year after winning promotion from League One.
He told BBC London 94.9: "I am not going to lie - we overachieved last year. Can we match that?
"It will be a tall order but we will go for it regardless of who is on the pitch, in the 18 or at the club. Everyone has to be thinking the same and that is part of my mantra.
"It is great when you overachieve because it shows what you can achieve if you set your mind to it, you are focused and your mentality is right. It will be tough for us, no doubt."
Charlton face Bournemouth on the opening day of the season.