Teenage Arsenal defender Krystian Bielik joined the Blues ranks on 31 January 2017 on a Standard Loan until the end of the 2016/17 season.
Bielik, who was born in the Polish city of Konin, is a Poland Under-18 international.
He began his professional career in home country with Legia Warsaw, where he made five senior appearances during his six months with the Polish champions.
In January 2015 he made the switch to Arsenal for a reported fee of £2.4m. He initially arrived at the Emirates Stadium as a midfielder but was soon switched to a central defensive position.
He has subsequently made two First Team appearances for the Gunners, the last of which was back in September 2016 in the EFL Cup, when Arsenal trounced Nottingham Forest 4-0.