Bradford manager Phil Parkinson has labelled his squad "vulnerable" ahead of the new season.
Parkinson saw midfielder Ricky Ravenhill suffer a knee injury in City's 4-0 defeat of non-league Guiseley on Wednesday and now wants to bolster his options with new faces.
"At the moment I'm still not happy," he told the Telegraph and Argus. "I feel vulnerable in certain areas and we've got to make sure we're stronger.
"I'm pleased with pre-season so far and we look in good shape. But we're still a few bodies short of where we want to be and we're working hard on that."