McCall's men welcome Coventry City to Valley Parade at the weekend for their second home game of the season following back-to-back away wins at much-fancied Peterborough United and Milton Keynes Dons.
The six-point haul has seen the Bantams establish themselves as one of the early pace-setters three games in but McCall believes his squad should prepare themselves for a challenging encounter against a Coventry side with a strong recent defensive record.
McCall said: "We're delighted to be coming back home with maximum points from our two league games on the road.
"Both of those games were extremely tough ones but we're expecting another stern challenge from Coventry.
"Like ourselves, they have only conceded one league goal so far and Tony (Mowbray, Coventry City boss) has them playing a certain way with three at the back.
"I'm sure the fans will be buoyant after the recent results, I know the players certainly are, but it might be a case of us being patience and having to dig really deep on Saturday.
"Naturally, we will want to get at them from the very start but, equally, we expect Coventry to be very difficult to break down.
"On top of their defensive qualities, we know that Coventry have talent going forward as well. They have players with pace and trickery that we will have to be aware of.
"As with all of our home games though, it will be a case of working on how we can break down the opposition and how we can use our strengths to attack any weaknesses we might find.
"There has been a bit said recently about the style of football we have been playing but the main thing for us is the character and togetherness of the players and the squad as a whole.
"There might be games when you can't play the football you want to play and you have to mix things up but you have to always guarantee that you give everything while you're on the pitch.
"There is clearly a positive buzz around the place at the moment, as you'd expect given the last couple of results, but we are all well aware that this will be a long, long season.
"There will be disappointments along the way, plenty of ups and downs, and it will be key how we react to them."