When asked about that game at Gtech Community Stadium, Klopp said: "Sometimes I remember bad things, but in this specific case not really. It is super challenging to play Thomas Frank and Brentford for different reasons.
"I’m not sure they are 100% happy with this season, but losing Ivan Toney was brutal. They are stable in the table, which is probably what they want.
"[They are] well organised and they had a few problems this season to get used to the game without Ivan, but when you look at the table they are in the middle with a tendency to go up.
"[They create] sensational set-pieces, have really fast offensive players, and their counter-attacking is really good. It is always interesting to play them - and difficult as well. But it’s Anfield and we should use that."
Klopp was asked if Frank's success at Brentford reminded him of his time at Mainz, one of the Bundesliga's smaller clubs.
"I am not sure Brentford are still in that bracket," he said. "They are too smart, they are doing too well [and conduct] very smart transfer business.
"Thomas is adapting. He is doing a brilliant job and he seems to be very happy there. He’s a cool guy and I respect him a lot."