In a statement last week, the now Beady Eye frontman said his brother had lied and he also endorsed the original line that Oasis dropped out of the V Festival in Chelmsford in 2009 because he had laryngitis.
Liam decided to take legal action at the High Court after Noel ignored a letter sent to his lawyers demanding an official apology, according to The Sun.
In a live webchat with fans last night, Noel admitted Liam did have a doctors note to prove he was ill and appeared to apologise to his younger brother.
''Yes there is truth in that story that Liam is suing me,” he said.
“For the record it is a fact that he was diagnosed with Laryngitis and it is a fact that he had a doctors note to prove it.”
He added: “I’d just like to say that if he gets offended by my opinions on such things then I apologise. It's all getting a little silly and out of hand and it's not very cool.''