A 66th-minute strike from the spot was all Liverpool needed to rake in maximum points against Aston Villa led by former captain Steven Gerrard.
The fierce encounter saw a hard-fighting Villa look like a side who would take away at least a point.
Having played ended the first half barren, the Reds intensified the pressure on their visitors which later paid off when Tyronne Mings brought down league topscorer Mohamed Salah down in the box.
The Egyptian rather chose a low hard right finish from 12 yards in front of the Kop.
That was goal No.21 in all competitions for the former Basel, Chelsea, Fiorentina and Roma man.
The Egyptian has now been involved in at least a goal for Liverpool in all their league games this season with the exception being a 2-0 win at home against Burnley.
Klopp’s men are still second on the log and are just a point adrift leaders City who also got all three points courtesy of Raheem Sterling’s penalty.