Felix Brych, 44, has been an international referee since 2007 and he is also a lawyer. This season, he refereed Napoli in the group stage when they beat Liverpool 2-0 and he will see them again when he referees the Napoli v Barcelona last 16 1st leg tie.
Last term, he did a Barca game, on 16th April to be precise, when Barca beat Man Utd 3-0 in the Champions League quarter-final match.
The German's assistants will be Mark Borsch and Stefan Lupp.
UEFA has also reported that the referee of Tuesday's other match, Chelsea v Bayern Munich, will be Clement Turpin of France.