York City have reported two recent break-ins at the club.
The National League North side say that items from inside the ground including seating have been taken.
Patches of turf from the pitch at Bootham Crescent have also been stolen.
York have said as part of a statement: “It is especially disappointing at a time the club is auctioning items to raise much-needed funds for the club, and is frustrating for management and players who are currently using the facility to train.
“The club is also due to start work on the careful and sensitive relocation of any ashes and urns which may be located under the pitch, an important process which will now be delayed due to the tampered surface.
“The club have been forced to increase security at the ground, an unnecessary cost during this difficult time for the club, and grounds staff are working hard to make the necessary repairs after the break-ins.
“We request anyone with information about the break-ins to contact the club directly.”