Kicker reports on Andrik Markgraf's signing of a professional contract with Union Berlin. Andrik Markgraf has signed a professional contract with Union Berlin. The duration of the contract was not disclosed. The 19-year-old left-back has been playing with the club since 2016 and recently recommended himself for the professional team as a regular player in the U-19 team. 'Andrik has developed well in recent years and has earned his place in the extended circle of the licensed player team,' said managing director Horst Heldt in a club announcement.