The Robins have enjoyed a flying start to the new campaign having won two and drawn one of their opening three games, and they will be looking to continue their unbeaten run against a Bantams outfit who have picked up just one point to date.
Veteran striker Julian Alsop moved to within two goals of Martin Devaney's Football League record of 38 for the club when he netted a late winner against Rochdale on Tuesday, his first after more than six years away.
Key midfielder Michael Pook remains sidelined for around three weeks after suffering medial knee ligament damage against Hereford last weekend.
That means Drissa Diallo is likely to continue at right-back with David Bird again occupying a place in the middle of the park.
However, Allen must decide whether to stick or twist with his forward line, with Tom Denton partnering Elvis Hammond in attack last time out and Barry Hayles and Alsop on the bench.