Lewandowski, 36, scored two of those goals, taking his tally for the season to an impressive 40 in 46 games across all competitions.

Speaking to the press ahead of the second-leg, Flick has compared the prolific Poland star to Real Madrid legend Ronaldo.

Flick said: "When you play at this level at this age... on one hand, it comes down to his fitness, and on the other hand, he takes great care of himself. 

“Like Cristiano Ronaldo, he has an amazing physical structure. He is very professional and controls all factors to deliver optimal performance."