Burglars smashed their way through the roof of Ossett Trinity rugby club and stole thousands of pounds in cash from the safe.
Thieves broke into the Church Street club overnight on Monday, August 31.
They stole around £2,800 cash from the club’s safe as well as rugby kits and trophies.
They also smashed pictures, desks and security cameras during the break-in.
Dave Ward, club treasurer, said the impact could be “devastating”.
Mr Ward warned: “This break-in could have an absolutely devastating effect on the club.
“The efforts that have been put in by so many people over the years is phenomenal.
“We’ve had people who have given 40 years of their lives to the rugby clubs. It’s just awful.”
Mr Ward said it will cost around £10,000 to repair the damage but fears where the cash will come from for repairs.
He added: “They have smashed up the office for no reason. It’s just mindless.
“We are insured but it won’t cover anywhere near the £10,000 and we’ll have to find the rest from somewhere.”
Anyone with any information about the incident should contact West Yorkshire Police on 101.