The Whittington and its private contractor Sodexo offered "sincere apologies" to Muslim patients and visitors for wrongly selling non-halal chicken in its canteen.
The Whittington said it was now "reviewing our relationship" with its contractor Sodexo. The firm was brought in on a five year contract in 2014 when all catering services were privatised by the NHS trust.
Hospital staff were informed today after the New Journal contacted the NHS trust for comment on Tuesday night.
Shirley Franklin, chair of the Defend Whittington Hospital Coalition, said: "All the food should be in house like it used to be. This is the outcome of it being privatised. It's a nonsense, that they save money through privatisation – they will save money if they take it all back in house."