Super League club Wakefield Wildcats say they have been left with a six-figure shortfall following the collapse of their main sponsors.
The decision of Eric France Metal Recycling to enter into into a creditors' voluntary liquidation has also hit Championship club Dewsbury.
In a statement, Wakefield Wildcats said: "Following a creditors' meeting with administrators KPMG yesterday, it appears highly unlikely that Eric France Metal Recycling will be able to fulfil their commitment of a significant six-figure sum as the club's main sponsor.
"Whilst this is a hole to fill in the club's budget, the areas of sponsorship available are the most prestigious with main shirt sponsor, East Stand sponsor and the back of the playing and replica shirts, making it an attractive proposition to a number of companies.
"The club is active in the market in its attempts to find a replacement sponsor."
Live sports action from the region's football teams today
Hundreds of cyclists and spectators descended on a former Halifax tip for a cycling event with a difference.
Melbourne Storm have regained Rugby League's World Club Challenge title after beating Leeds Rhinos 18-14.