Journalist Sam Dean spotted one unexpected Arsenal star giving advice to Oleksandr Zinchenko during the Gunners’ clash with Porto. Fabio Vieira was spotted giving instructions to Oleksandr Zinchenko whilst Arsenal battled with Porto on Tuesday night. Vieira has never come across as the most expressive or forthright player in his time at the Emirates Stadium so far. The attacking midfielder is yet to nail down a regular starting berth under Mikel Arteta, or show that he can consistently shine at Premier League level. Therefore, it may well surprise some Arsenal fans that he was seen telling Zin…