Union Berlin managing director Oliver Ruhnert has praised defender Leonardo Bonucci despite a modest season at the Bundesliga club and amid speculation that the Italian veteran will leave during this month’s transfer window. Union raised eyebrows when they signed the Euro 2021 winner from Juventus in summer after finishing fourth in the Bundesliga and qualifying for the Champions League. Bonucci, 36, failed to become a regular starter and featured in only 10 games in a season where Union are struggling in 15th place in the league and failed to register a victory in Europe. “He is a very positi…