It's their seventh signing for the 2013 season, and Hull FC have agreed a two year contract with the 25 year-old.
The full back made 21 appearances with Hull KR and earned a call-up to the Exiles team that too on England in the International Origin series.
– Shannon McDonnell, Hull FC 2013 signing
'Hull FC is a good place to be, the club are moving forward and they have recruited well for next year so I know I've made the right decision.
It took me a bit of time to settle in another country this year and the weather makes it a bit of a culture shock when you first come over, but I love the city and I just can't wait to get back over there and get things underway."
– Peter Gentle, Hull FC Coach
"Shannon is a player I have followed for a number of years and he impressed in his first season over here with Hull KR, but there is still a lot more to come from him. Along with Richard Horne, he will give us some real strength in depth in the full back position next season."