Guto Harri, who worked in City Hall alongside Boris Johnson, was forced out after making the gesture in the aftermath of England's defeat to Italy.
Viewers claimed they were going to boycott the station following the gesture.
Guto Harri, pictured, was suspended by GB News after he took a knee live on air causing outrage among the station's viewersInsurance Loans Mortgage Attorney Credit Lawyer
Nigel Farage is set to host his new prime time GB News show from Monday, July 19
Writing in the Sunday Times, Harri warned producers in advance that he was considering making the gesture on Tuesday's broadcast. He was told if he was to do so he should look towards a specific camera.
Harri wrote: 'What followed was a tsunami of disappointment, resentment and hate. Old friends were amused to see me described as woke and Marxist. By Thursday night, the boss called and I’d been taken off air for the summer.'
He said he was told he had 'offended the lynch mob' and suggested it was incorrect to suggest he was responsible for a decline in viewer numbers, which he said 'dropped pretty swiftly after launch and kept slipping.
In the aftermath of what happened to him, Harri said: 'The channel is rapidly becoming an absurd parody of what it proclaimed to be. Rather than defending free speech and confronting cancel culture, it has set out to replicate it on the far right.'
New presenter Nigel Farage has promised he will 'not be taking the knee' as he is set to head up a new prime time programme on GB News.
The ex-UKIP leader, 57, will host 'Farage' at 7pm on the national news channel from Monday, July 19.
Mr Farage called on the public to support his new venture as he revealed details of the one-hour show on social media.
The move comes after presenter Guto Harri was suspended for taking the knee live on television in a move that angered many viewers.Insurance Loans Mortgage Attorney Credit Lawyer
Mr Harri took the knee on Tuesday in solidarity with black England football stars after they suffered racist abuse in the aftermath of the team's defeat on penalties in the Euro 2020 final.
But it offended some viewers amid criticism that anyone who takes a knee - including police officers, sports stars and TV presenters - risks being seen to endorse some of the Left-wing ideas promoted by the Black Lives Matter organisation, as well as opposing racism.
The ex-UKIP leader, 57, will host 'Farage' at 7pm on the national news channel from Monday, July 19
Announcing his new role on GB News, he said: 'Since politics I have done a fair bit of broadcasting. Broadcasting matters, it really does.
'It gets people to look at issues, think about issues in different ways and be very influential.
Mr Farage referenced his previous three year tenure on LBC, and his YouTube channel that has more than 270,000 subscribers.
He promised to take up broadcasting on 'a regular basis', as he revealed the finer details of his new show Farage.
Earlier today, a source at GB News told MailOnline: 'Farage already has a weekend show on GB News, but yes you're right in thinking he is getting a more regular slot.'
They suggested that the 57-year-old's new role will see him make a daily appearance on the channel.
Rumours of the addition were already swirling on social media.
One Twitter user wrote: 'GB News here he comes', while another said: 'I'm thinking a roving reporter out and about on GB News would be great.'
'The new boss of GB News,' predicted another.
Mr Harri's gesture last week sparked a viewer boycott with several GB