Steve McNamara has ordered his Bulls side not to get blasé at Hull KR.
Rovers were blitzed at Harlequins last week and are currently off the play-off pace, leaving in-form Bradford favourites to pick up a fourth successive win on Sunday.
But the coach said: "Rovers pose a very serious threat and the game's never safe with them. I was there a few weeks back when they were 28 points down against Warrington but nearly came back to win. You can't switch off. We've got some momentum going but we need to keep that and build on it."
Hull KR are in only their second Super League season and have yet to defeat the Bulls, losing twice last year.
But McNamara added: "As a club and organisation, they have improved out of sight.
"Their recruitment and playing personnel, with players like Chev Walker, Ben Galea and Daniel Fitzhenry, is there for all to see and with their overall development - that crowd, redeveloping the stadium - they're a credit to the game."
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