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18th February 2022
11:17am GMT
However, at the turn of the year, the bombing corner back said that although "going to Australia to play professionally was a really interesting opportunity and it was something I wanted to research and consider in detail" he had decided to stay in Ireland.
Now, with the National League about to play its third weekend of football, James Horan looks set to give his young defender his first start of the season.
Mullin is one of seven changes that defeated Monaghan a couple of weeks ago, and they will need all of the firepower they can get as they take on the longtime kings of the sport, Dublin.
Although the capital have gotten off to a rocky start, losing to Armagh and Kildare in their opening games, the Dubs will be more up for this game than most.
This will be the first time the two teams have faced each other since Mayo ended their seven year unbeaten streak in the championship last summer.
The Connacht champions were the first side to finally topple the giants, and although they still didn't win the All-Ireland that year, it is them that Dublin will want to seek revenge on.
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