Derby scored the only goal as Arsenal were beaten by Derby County . January signing Krystian Bielik made his U21 debut for the Gunners . The £2million teenager saw a headed effort cleared off the line late on .
Ivan Calero scored the only goal as Arsenal were beaten by Derby County . January signing Krystian Bielik made his U21 debut for the Gunners . The £2million teenager saw a headed effort cleared off the line late on .