The winger has revealed that he's undergone surgery on a persistent ankle injury.
Stockdale hasn't played since Ulster's opening game of the United Rugby Championship. He played the full 80-minutes of the 35-29 win over Glasgow Warriors, but has been sidelined since.
"It’s been a really frustrating couple of months for me with this ankle as nothing has seemed to go right with it. But hey, that’s life," said the 25-year old.
"Glad to have gotten the op now and hopefully puts me on the right track back to recovery!
"I’m gutted this probably means the end of my season but gives me an opportunity to come back fitter and stronger than ever."