Many were impressed by the Liverpool centre-back, who looks as though he could finally become the real deal under a manager who actually knows how to coach a defence.
Defensively, Sakho has been good over the years but has looked shaky on the ball. At Tottenham on Saturday, though, the Frenchman looked flawless in most areas.
Two of his blocks and last-ditch slides were vital and Liverpool fans can perhaps look forward to an exciting partnership of Sakho and Martin Skrtel... if the latter can keep up with the Frenchman.
Like Sakho, Mignolet has often impressed in certain areas in the past. Namely, his shot stopping. It's other areas where the Belgian struggles.
But that doesn't change the fact that Mignolet's shot stopping was phenomenal against Tottenham. He denied Harry Kane and Clinton Njie with point-blank saves and the Reds 'keeper looked a new man in terms of momentum and confidence.
At Spurs, the 27-year-old was just too soft. He kept falling over, not linking up with team-mates - and almost cost Liverpool a goal with a poor back-pass.
That said, Lallana is certainly the creative type of player Jurgen Klopp could use at Anfield. The German will likely try and improve the playmaker, getting him fitter and stronger. But he may have to move him on in the summer if the Liverpool man hasn't improved by then.
With Daniel Sturridge, Liverpool could easily have had two or three goals against Tottenham. Origi is young but, considering the praise that was lavished on him when he moved to Anfield, his form for the club so far has been very poor indeed.
Against Spurs, Origi lacked confidence and didn't look like he once knew where he was supposed to run. Again, Klopp can develop him. If not, Liverpool are short of options up front until January, with Sturridge often injured, Christian Benteke a square peg in a round hole and Danny Ings out with a very unfortunate ACL tear.