The FATHER AND SON singer, who now stars in British TV soap CORONATION STREET, refuses to regroup with the Irish boyband unless all five members return.
Keating has previously stated his intention to remain a solo singer.
Duffy says, "If I was going to get back with Boyzone I'd like to do it with Boyzone. And that means the four guys I toured with for eight years. It wouldn't be the same without each individual member."