The former Rangers youngster started up against the Liverpool new boy as Everton held the Champions League finalists to a goalless draw.
It was a tough test for Patterson with the £50million signing already proving his worth in the Premier League this season.
But the Colombian forward failed to deliver in his first derby clash as Patterson kept him quiet throughout the 90 minutes.
The ex-Rangers kid’s performance earned the plaudits from Celtic hero Alan Stubbs as he hailed him as Everton’s new fan favourite.
And now Patterson laughs that Diaz is still feeling the effects of his masterclass showing back on September 3.
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Ahead of Scotland’s Nations League clash with Ukraine, James McFadden spoke to the right-back about his first clash with Liverpool.
McFadden asked: “Did you let Luis Diaz out (of your pocket) after the game or is he still in there?”
Patterson then joked: “Aye, probably still.”
He continued: “To be fair it was a good game, he was a tough opponent.
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“Obviously he’s a great player, he’s playing at a great club as well so it was obviously a challenge for me to go and show what I can do and try and nullify their threats, and I thought I done that.”
But he admitted it was an “unbelievable” experience facing Liverpool at the “bonkers” Goodison Park after playing in front of no fans during the Old Firm because of the ongoing Covid-19 pandemic.
He added: “It was good. obviously I’ve played in Old Firms but without any crowds so to experience a Merseyside derby at the bonkers Goodison as we say.
“It was good and the atmosphere was unbelievable.
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“I thought we might have nicked the win but obviously the goal got chopped off.
“But it was a great game and I really enjoyed it.”