Their warnings come as the X Factor babe faces her first Valentine's Day without her 30-year-old ex-husband.
'Girls Aloud' bandmate Kimberley Walsh has admitted being terrified about the strain on her pal.
"I do feel a bit protective. I don't like the fact she's so trapped sometimes, trying to go out and about. There's not a great deal you can do about it but it frustrates me," the Daily Star quoted her as telling Cosmopolitan magazine.
"Everyone deserves a little bit of freedom and she doesn't have that," she said.
The concerns come after a tough year for Cole in which she split from Ashley and battled malaria. (ANI)