Ferris, a former British & Irish Lion and Ireland international, sustained ankle damage in a match against Edinburgh in November 2012.
And despite making a handful of RaboDirect PRO12 appearances since, the 28-year-old has never fully recovered.
It is a premature end for a player that had achieved much in the game in a short space of time - but Ferris insists his memories with Ulster will always remain with him.
"I've had three surgeries on my right ankle," he said. "The whole thing is scarred up. I've very limited range in it, I've got feet problems now and I have nerve damage in my toes," said Ferris.
"Hopefully a couple of months' rest and doing absolutely nothing on it means it will settle down.
"At the same time, I've played rugby for the past eight or nine years for Ulster, Ireland, and I've enjoyed every minute of it. I wouldn't change anything. I've got no regrets.
"I just look forward to the future now and supporting the the boys from the stands."
To get your hands on tickets for the RaboDirect PRO12 final, visit http://www.rabodirectpro12.com/final/tickets.php
Guinness PRO12 Ulster News
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