The Poland star revealed that since the forward joined on loan from Manchester United, he has consistently impressed, both on and off the pitch.
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"After a few training sessions, no. He has huge potential," Lewandowski said to Sky Sports.
"He has everything. He has speed, he has technique, he has a shot, he has left foot, right foot, skills. Marcus is the guy, if you give him confidence and he sees that you believe in him, he can give you back 200 per cent."