The Bulls will sign at least one more player before the close-season is up, says chairman Chris Caisley.
The club is not currently negotiating with anyone but will move to shore up their departure-hit squad, said Caisley,
pictured.
"We've nothing that is on-going at the moment but we are hoping to add one more to our squad before the start of next season.
"We are just a number short. Five players are leaving and we have signed just the two, so it really is just a bit of a numbers game."
But the Bulls aren't scouring the footballing world for a hooker, with Caisley believing they have plenty of depth in the position.
"We are not too concerned about that. We've got Robbie Paul, who has played hooker at international level, and Karl Pratt who can play there, so I don't think we are too concerned."
The 21-year-old academy graduate Aaron Smith could also push for more game time in the first team next season.
St Helens, meanwhile, have confirmed the signing of Bulls' Great Britain international Lee Gilmour.
Saints coach Ian Millward said: "Lee will play mainly as a second-rower, although he can and will play other positions.
"We have brought him in because of his tremendous athleticism and tremendous footwork in attack.
"Whenever we played the Bulls he always caused us problems and he has a great attitude towards the game."
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