The Bantams have been one of the busiest League One clubs in the market after bringing in eight players since winning promotion.
Crawley striker Will Swan is the latest new addition in the build-up to the Valley Parade curtain-raiser against Wycombe on August 2.
But the City boss insists the existing squad who got them up last season deserve just as much attention.
“It’s interesting when we come back to training and there are new players,” said Alexander. “You’re looking at the ones already here and how they interact and rise to the challenge.
“Always at this time of year and January, it’s all about recruitment and people talk about the new players a lot.
“I get that but I also think it’s really important for us to remember the many good players we already have here. They’ve got us to where we are.
“I genuinely believe there are players who haven’t played at this level and can make that progress.
“We believe the improvements we have to make as a team going forward into League One, those individuals can do the same.
Ciaran Kelly signed a new one-year contract last week (Image: Thomas Gadd)
“There’s a place for new recruitment and bringing in new players. But there’s also a responsibility on us to develop players that are already here and we feel can continue the journey with us.
“That’s part of the reason we signed Ciaran (Kelly) and there are others we think have the attributes and the attitude to put the work in.”
After Kelly penned a one-year deal, City are still hopeful of good news with Lewis Richards as he considers their new contract offer.
But Alexander is pleased to have bolstered the squad so much at this early stage of pre-season.
He added: “I think there’s still a bit of work for us to do and improvement to make.
“But we’re delighted with our recruitment. What we’ve brought in fits the profile of what we look for.
“To have seven in by the first week of pre-season, so we’re reasonably strong in numbers, is really encouraging.
“We play a certain way, defend in a certain way, press a certain way and the longer we have with the individuals to form one group the better.
“There are a lot of players from last season but you’ve got seven recruits so it’s going to be a new team with the change in personnel.
“It’s forming the whole thing together and we’ve got a good base to work from with what we did last season.”