Noel Gallagher insists his brother Liam needs to get help with his ''anger'' problem.

The 50-year-old guitarist has been saying his former Oasis bandmate needs to seek the help of a psychiatrist since he publicly hit out at him for not performing at Ariana Grande's charity concert, which was staged a few weeks after a terrorist attack at her concert in their home city of Manchester.

Addressing his sibling's behaviour at a press conference in Italy recently, Noel said: ''The other stuff with Liam is f***ing crazy, because that other fella seems very angry about something and no one is quite sure what it is.

''But if someone does please let me know. I think he needs therapy, I think he needs a psychiatrist.''

Noel - who insists he wasn't asked to perform at the star-studded-concert - found himself under attack by Liam again when he headlined the reopening of Manchester Arena in June and appeared emotional while singing 'Don't Look Back in Anger'.

At the time, Noel refused to criticise Liam for his decision to play his own comeback single, 'Wall of Glass', at the Manchester tribute concert.

He simply said: ''Well, my instinct, were I young, high and drunk, would be to go on a rant. But I'm dignified now.''

The 'Death of You and Me' hitmaker can't understand why his fractured relationship with Liam - who he has barely spoken to since their group Oasis split in 2009 - has influenced so many of his sibling's songs, especially when he has other personal issues, such as the 2014 breakdown of his marriage to Nicole Appleton, to draw inspiration from.

He said previously: ''You'd think he'd write songs about his divvy ex-wife, having just been divorced from her, know what I mean?''