Quoted by Fotboll Transfers, The German said of Salah: "Mo is definitely up there on the same level as Lewandowski.
"He is a real goal machine nowadays and his professionalism is of the highest class.
"In addition to his technical qualities, he is desperate to score goals and it is a good quality to have. That's exactly how it is with Lewa as well."
Against Brentford on Saturday night, Salah struck in the 3-3 draw - marking his 100th Premier League goal for the Reds. The result leaves Liverpool top of the Premier League table, a point clear of second-place Manchester City, the defending champions.
Egypt international striker Salah has played seven games for Liverpool this season, scoring six goals. Overall, the 29 year-old has scored 131 goals in 210 games for the Reds.
Liverpool are in talks to extend his contract, which has less than two years left to run.
- updated September 27
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