The 75-year-old, who plays Weatherfield legend Blanche Hunt, was admitted to Hope Hospital in Manchester at the weekend for life-saving surgery.
It is thought that the soap star has now undergone an emergency operation, though full details are yet to emerge.
A Coronation Street spokeswoman confirmed to DS tonight that Jones remains at the Hope.
She added: "Our thoughts are with her family and everyone wishes her a speedy recovery."
Jones made her debut as Blanche in 1974 and played the role for four years. She later returned for guest stints and made a permanent comeback in 1998.
The actress has established herself as a fan favourite in recent years and won the funniest performance prize at the Inside Soap Awards last month.