Bradford will have Peter Jackson in charge for the first time since Peter Taylor left the club.
Captain Simon Ramsden is out with a thigh strain, while midfielder Tommy Doherty remains sidelined following an ankle operation.
Gillingham manager Andy Hessenthaler told BBC Radio Kent: "It's not going to be easy, their new manager [Peter Jackson] will have his team fired up, they didn't play midweek and it'll be a difficult game for us.
"We've got to focus on our own performances and try and turn some of these draws into wins.
"We've got to attack them, we've got to take the game to any team that comes to Priestfield."
Source: BBC Sport
Source: BBC Sport