The 35-year-old former Westlife star once shocked fans when he announced that he was leaving the group in 2004.
McFadden doesn't think that he has got any advice worthy of Zayn because "every situation is different", reported Daily Mirror.
"I don't really have any advice for him. No one was there to give me any advice. I haven't spoken to Zayn. I have spoken to some of the other boys but I don't really know what's going on. It's difficult to adapt to life on your own when you spent so much time in a band, you kind of become a family," the 35-year-old singer said.