The midfielder did not always impress with the Gunners, but Klopp is not surprised to see him shine at Luton.
As they prepare to play Luton at Anfield on Wednesday, Klopp told reporters: "(Albert Sambi) Lokonga when you see him playing and you think, oh - He's an Arsenal player and they loaned him? Interesting."
He also added: "Set-pieces are a strength (of Luton) but I have to say the way they play, they play incredible but even in games they lost they were in it.
"We experienced a tough game there and now in possession they found a structure where everyone is comfortable. Ross Barkley is a nice story where he is back to his best, or better. A deeper role, disciplined and extremely strong. Lokonga when you see him you can tell he's an Arsenal player on loan.
"They are a really together (squad). The situation at Bournemouth when the captain (Tom Lockyer collapsed) brought them closer and made them think some things are worse in life than maybe getting relegated. In general they deserve respect. We have to show that with a proper Liverpool performance. Everyone who enters the gate to Anfield has be on their toes."