Ex-Celtic star Virgil Van Dijk has recalled his Champions League nightmare against Shakhter Karagandy - where fans turned on him for a dreadful performance in the first-leg.
The Dutch defender had only recently signed on at Parkhead from Groningen and was pitched straight into the starting eleven for the clash in Kazakhstan.
Neil Lennon's men were beaten 2-0 in a shock result that left Celtic supporters gutted back home.
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And Van Dijk remembers the furious response to his performance - accepting that he "wasn't good enough" on the night.
Speaking on Graham Hunter's Big Interview, Van Dijk said: "I made my debt against Aberdeen away and we won, which was good.
"But a couple of days after we went to Kazakhstan.
"Neil Lennon put me in so I started that game on artificial grass, and we lost 2-0.
"That was very testing because we stayed overnight and I got so many bad reactions from so many fans.
"They were right, I was poor that night, so then it was about how you're going to bounce back.
"I remember the return game at Celtic Park because it was the final game before you're either going to be in the Champions League or not, I was on the bench.
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"We went 1-0 up, 2-0 up and then three.
"So basically we were through then and in the last couple of minutes I came on and we all celebrated.
"We were going to play Champions League and that was one of the main reasons I went to Celtic to experience the Champions League."
Van Dijk put the performance and comeback in the second-leg down as a learning experience.
And he believes he was quickly able to put it behind him and prove to Hoops fans around the world that he was the right man for the job at centre-back.
He added: "It was a very challenging couple of weeks at that time but after three or four games I had the flow and kept playing and progressing.
"I felt so good and the quality of my game kept getting better as well.
"Becoming champions was a big thing for me, you take it all in and it gets you more experience."
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