Colbon, 29, has been training alone after leaving the capital, and he is relishing the opportunity to pull on a Black and White shirt.
“All the adversity I faced at London last year and the uncertainty of having a job really put things into perspective,” said Colbon.
“I’ve had to do an internship and look at coaching as I wasn’t sure if I’d find another club at this stage of the year, but this offer from Hull came out of the blue and I’m really excited.
“I’ve been doing a lot of fitness training on my own and I’m just really looking forward to getting back into a team environment.”
Standing at 6ft 2in, and weighing 100kg, Colbon is comfortable on either the right or left flank and brings further competition for places in the Hull back-line.
“I played against him on a number of occasions and he was a real handful to tackle. He brings plenty of grunt and intensity out of back field, which is what we’re after, and he adds to what both Tom [Lineham] and Fetuli [Talanoa] bring to the team. It’s healthy competition in there for us.”