The rocker - whose bride-to-be will reportedly wear a Galliano creation when she walks down the aisle in July - believes the former Christian Dior designer, who was caught on video proclaiming his love for Germany dictator Adolf Hitler, has many issues which need to be dealt with.
He said: "I haven't seen the video and I don't even know John that well, but I feel like people have got to see reason here.
"John has a problem with alcohol, and the reality is that when we're in trouble, and that's all of us, we say the most violent, cursed things.
"You can judge them on the stupid words they said - which I think were stupid, I hope that goes without saying - or you can dig a bit deeper and you can try and find out what the problem is."
Jamie thinks the designer's outburst was not political and believes it proves Galliano - who has since been sacked from the French fashion house - has other problems and needs help.
He added to the Sunday Times magazine: "I think it's obvious that it's alcohol. People are trying to say those are his politics. 'I love Hitler' - that's not political, that's somebody in trouble."