He will likely rise to the occasion, having played at the top level for 11 years after making his start with Leicester Tigers in 2005.
And Humphreys is adamant that he is happy playing second fiddle to Jackson - but still has plenty left to offer the Irish province.
"I understand my place in the squad," Humphreys told the42.ie.
"Jacko's playing really well and because he's goal-kicking so well it's tough to bring him off in such a tight game.
"I've been doing what I can to stay fit for whenever I do get a chance. So hopefully whenever I get that chance I won't be vomiting on the side of the pitch too early.
"The body still feels great, so I'm keen to keep playing as long as Ulster decide to keep me. I still have a lot to offer on and off the pitch.
"I'm getting on, 33 now, but at the same time if you look at my career I haven't played that many games. So my body's still pretty fresh and I'm lucky enough over the last four or five years that I haven't had any major injuries."
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