VIDEO: That's a knockout! Robert Lewandowski shows off his playacting skills in Barcelona training after taking 'punch' from team-mate Wojciech Szczesny

Barcelona players are in a light-hearted mood as they are on the verge of completing a very successful season under Hansi Flick's tutelage. The Catalans completed the domestic treble, winning the Spanish Super Cup, La Liga and Copa del Rey titles. They also enjoyed a 100 percent record in four Clasicos against arch-rivals Real Madrid.

Ahead of their final game of the season against Athletic Club on Sunday, Lewandowski and Szczesny were spotted in a playful mood during a training session. The Polish goalkeeper jokingly gave a knockout 'punch' to his compatriot, and the striker hilariously fell straight to the ground. Szczesny clearly did not touch his team-mate as Lewandowski showed off his playacting skills.

Lewandowski is virtually out of the La Liga Golden Boot race, as he trails Real Madrid star Kylian Mbappe by four goals going into the final matchday.