Ryan Jones admitted it was a dream come true after a man of the match display in the Lions' 30-19 win over Otago in Dunedin on Saturday.
Jones only teamed up with the tourists this week after replacing the injured Simon Taylor.
"A week ago, I wasn't here, so this is a dream come true - a once in a lifetime opportunity," said Jones.
"I just wanted to give it 110%. Clive asked me to do a job, and I just went out there and played."
Jones' superb performance at the base of the scrum was capped by a second-half try.
And he admitted it had been a surreal experience having initially been in Canada on tour with the Welsh national side before his late call-up.
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My goal this season was just to get into the Ospreys regional team, so it's hard to put into words, really
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"I was in my hotel room in Toronto when the call came and, first of all, I thought it was one of the other boys taking the mickey," he said.
"And then, coming here on the plane, I sat there thinking it was all quite daunting going out to be with so many seasoned international players, guys that I have always admired.
"But they've all been a massive help and they were great again today, helping me through it."
All Blacks coach Graham Henry earlier this week said the 24-year-old "could be a very special player".
And Jones' starring role on Saturday marked a remarkable season for the Newport-born player, who moved from the Celtic Warriors to the Ospreys last summer.
After becoming a regular in the Ospreys first team, he won his first Wales cap against South Africa last autumn.
An injury to Dafydd Jones then opened the way for him to play a major role for Wales in their Grand Slam campaign, and he also impressed in Wales' 77-3 win over the USA last week.
"I only started my Test career last November, and having won a Grand Slam with Wales, it wouldn't have been a bad season had it just ended there," said Jones. "But this is incredible.