Leeds have already signed talented youngster Luke Murphy from Crewe, and Brian McDermott will look to add to a squad that finished in 13th position under Neil Warnock last season.
"Our ambition is to be back in the Premier League in two years and we think that's a realistic goal, it's what we are aiming for," Haigh told The Sun.
"We have said we want to build a sustainable future for Leeds and bring the last sleeping giant in English football out of its slumber.
"There's so much untapped energy at this club. I have been at Leeds when there has been 9,000 fans there and when it's been full to the brim.
"The atmosphere can be supercharged.
"We will need that in pursuit of our goals and we don't think it's unreasonable for us to aim for the Premier League in two years' time."