Divock Origi injury-time goal helped Liverpool maintain their spot in the PL standing
The Belgian came off the bench to score in the sixth minute of stoppage to prevent neighbours Everton from escaping with a point at Anfield.
Origi nodded in Virgil van Dijk loop which struck the crossbar after Everton's goalkeeper Jordan Pickford failed an attempt to parry the ball over the bar.
And Klopp who was stunned by Origi's late intervention is moved to discuss the Belgian future at Liverpool.
Klopp said: "When the ball left Virgil's foot, I thought it was (going) over. Then you see there's backspin and the ball changes direction, hits the crossbar, and it was a very unthankful job for Pickford.
"Then Divock was there. It was a very intense game and obviously it is a much nicer finish for us.
"I said it to him, when I went to him on the pitch I had it in my mind, I've never forgot it since.
"Fouls and harsh tackles happen, but in his case it was so obvious that it was a break in his development.
"At that time he was outstanding. After that, it took a long time before he felt absolutely nothing.
"In the Europa League final (against Sevilla in 2016) he was somehow ready but not completely pain free. Then there was a tournament (Euro 2016) when he couldn't really show up there.
"It all changed a little bit (for him), you lose confidence and you don't play from here any more."
"When Div played at that time he was an unbelievable threat, he had speed, he was strong, remember the Dortmund game and stuff like that.
"So it was always in my mind about Div, that night (against Everton). And coming on tonight, he can finish that book and from now on everything will be fine again."
Origi 23, have scored three times in four derby appearances for the Reds.