"On the defensive side, the last two games he was outstanding", Klopp said at a news conference on Friday.
The veteran put in a stellar showing against Les Parisiens and his tremendous work rate was put to good use as the Reds shut down Neymar each time the world's most expensive player got a whiff of the ball.
"Then I remember, it was a time of a lot of soul searching and anyway I looked at it - potential moves, who might be interested and who definitely won't be - and I remember writing an email or a letter to my agent explaining that 'I keep coming back to Swansea, that's all I really want". And I have to decide whether I talk about that or not, do I leave them alone in that situation or do I talk to them, all that stuff. But he is still a threat, had fantastic situations in both games and he is in good shape.
The chorus of You'll Never Walk Alone under the lights is enough to pick up even the least motivated of players and the enthusiasm goes hand in hand with Jurgen Klopp's gegenpressing style.
Southampton will be without Danny Ings as he's not allowed to play against his parent club while Manolo Gabbiadini will face a late fitness test on a hamstring injury. I just wanted to let him know, could we sort this out. Previous year he missed chances.
Sturridge, who started Liverpool's Champions League Group C opener against PSG on Tuesday due to the injury sustained by Roberto Firmino on Saturday, opened the scoring with a header after getting on the end of Robertson's cross. "He's a proper professional, so his body gives him the opportunity".