Manchester United have been told "major improvements" are needed to ensure food sold at Old Trafford is safe to eat.
The Premier League side have been given a one star out of five food hygiene rating after a Food Standards Agency inspection last month.
The Red Devils admitted "a small amount of undercooked meat was inadvertently served during a non-matchday event".
"This was an isolated issue and the immediate failures were quickly addressed," the club said.
United said they are also conducting an independent food audit to identify any further areas of improvement.
"MUFC has taken this incident very seriously and wants to reassure our valued fans and customers that we maintain the highest culinary standards," the club added.
"The club is proud of the high standards and the five-star food hygiene record which had been awarded to us for the past eight years.
"Everyone at the club is determined to regain our five-star food hygiene status as quickly as possible."
