The 18-year-old played 90 minutes in the Gunners’ 8-0 win over Viking FK last night at centre-back.
He signed for Arsenal in January 2015 from Legia Warsaw as a defensive midfielder but he has regularly played at the back for Arsenal’s under-21 side.
Arsene Wenger is without Per Mertesacker due to injury and Laurent Koscielny due to an extended break but Bielik admits the pair have had a big impact on his development into a defender.
**ARSENAL TRANSFER NEWS: WHO DOES WENGER WANT? WHO HAS SIGNED? WHO COULD LEAVE?**