Mr Barwick will lead Team Liverpool - the group hoping to fend off competition from Manchester and Birmingham and land the showpiece event.
The 62-year-old scouser, currently chair of the Rugby Football League, was originally being brought in to lead Liverpool鈥檚 bid for the 2026 games - but after hosts Durban pulled out, all eyes are on 2022.
He said he was delighted to accept the call from Joe Anderson to lead Liverpool鈥檚 charge.
He added: 鈥淗aving worked in and around sport most of my adult life, the chance to lead the work for my home city of Liverpool to host the Commonwealth Games is a huge privilege.
鈥淚 am delighted to be involved in this project and clear that Liverpool, with such an illustrious sports history, will make the perfect host for the Commonwealth Games.
鈥淛oe rang me up and asked me to consider it, it didn鈥檛 take long - I think I can be quite useful.
鈥淚 have had 40 years working in top flight broadcasting and sport and to be able to give something back to the city has always been important to me.?/p>
He added: 鈥淟iverpool is on the frontfoot at the moment and this can be another chapter in its illustrious life.?/p>
The council says the appointment of Mr Barwick shows how serious it is about the bid - and it has provided a budget of £500,000 to ensure it is successful.
Mayor Joe Anderson said the economic benefits of landing the games would be huge.
He said: 鈥淭he games has the potential to be a game changer in further driving forward the city鈥檚 regeneration and renaissance, reflecting our growing confidence and attracting jobs, investment and profile that money simply can鈥檛 buy, putting us on the world map.
鈥淏rian鈥檚 appointment, alongside a number of other highly respected advisors, sends out a powerful message that we are deadly serious about bidding for the games.
鈥淲e already have a first class reputation in putting on major events during and since our time as European Capital of Culture in 2008.?/p>
Mr Barwick will lead a team of experts who have been involved in successful bids for events like the Olympic Games and the FIFA World Cup in the past.
This includes Dr Denise Barrett-Baxendale, director at Everton Football Club, who will take on the deputy chair role for the bid team.
She said: 鈥淟iverpool has proven itself time and time again as a natural home for world class events. I am incredibly proud to be part of Team Liverpool.?/p>
What happens now?
We are told that an 鈥渋ntense鈥?3-6 month period of activity will now get underway to put together the strongest possible case for Liverpool to be host city.
This will involve looking at venues for sporting events such as ACC Liverpool and the proposed new Everton stadium at Bramley Moore Dock against the technical requirements set by the Commonwealth Games Federation.