Lallana scored his fifth goal of the season in the Reds' 3-0 win over Manchester City.
Lallana's strike from distance certainly seemed to catch the Reds' boss off guard as Lallana set Liverpool on their way to a comfortable Premier League victory to move themselves to within six points of the top four.
Klopp told reporters after the game, as quoted by the Liverpool Echo: “He doesn't shoot too often, but if you aren't satisfied with your scoring record then the first thing you do is shoot more often!
“In that situation he'd usually pass, so for him to shoot, it was a surprise.
“In the first half he was a bit (below his level) but in the second half it looked like the first half was just warming up.
“He really was outstanding. But there were so many brilliant individual performances."
Lallana's goal record has improved a little of late, though injuries have kept him sidelined from improving on it a little further.
For much of his Liverpool career, one criticism that could have been levelled at him was a lack of goals and that he doesn't gamble enough.
Last season he only managed to find the net on six occasions, and he failed to score a Premier League goal this term until January - now he has three in the league, and five in all competitions.
But it seems clear that more goals is something that Klopp wants to see from the 27-year-old and be that more willing to go for goal. Recent displays suggest he is trying to improve on that total, and Liverpool will hope for something of a purple patch from him between now and the end of the season.