The Germany international has hailed the prolific striker's performances and has stressed that BVB must beat Marseille on Tuesday
Lewandowski netted twice in Dortmund's 5-0 win over Freiburg at the weekend to take his season's tally to six goals in seven Bundesliga appearances and Reus has nothing but positive words for the 25-year-old.
"What's left to say about the guy? He's a world-class striker," Reus was quoted as saying on the official Bundesliga website.
"He's almost unbeatable one-on-one and has an incredible eye for an opening. It was a really great goal."
Reus then went on to discuss Tuesday's Champions League encounter against Olympique de Marseille and stressed that BVB cannot afford to spill points again after their loss versus Napoli on matchday one.
"It's going to be tough against Marseille one way or the other. But after losing at Napoli, we have to get the three points this time."