The Take That star, who has in the past battled with drink and drug problems, doesn't want the 17-year-old to follow in his footsteps.
Robbie told X magazine: 'I wasn't as fragile as she is when I was 16, I want to give her a call but I don't know if I can help.
'She's going through a difficult time, it's not the best set-up for her.'
Cher was reportedly close to collapsing after the first results show, sparking fears she is in a fragile condition.
The 36-year-old added: 'She's not going to have a good time this year.
'She's obviously got it but she'd have done well not to get through and have another year to come to terms with her personal life.'
Producers on the talent competition are allegedly keeping a special watch on the singer.