Former manager Ole Gunnar Solskjaer says there is "no magic wand" to fix the problems at Manchester United.
It was their 11th defeat in the Premier League this season and left Erik ten Hag's side sixth in the table.
"With Erik, I hope he is going to be successful. I hope he is going to make it but you never know what the new owners are thinking," said Solskjaer.
"It's about results and consistency the rest of the season."
Ratcliffe will oversee the club's footballing operations, but the Glazer family remain as majority owners.
The British billionaire called for patience from fans and told the BBC: "People unfortunately need to give us time to get back.