Juventus reportedly sent a scout to watch Fernando in action during Porto’s midweek game against Zenit St Petersburg.
The Brazilian midfielder has been identified as a possible January transfer target for the current Italian League leaders.
The 24-year-old, thought to be valued at around €8m by the Italian club, played in all 90 minutes of the 0-0 Champions League encounter.
Porto may be wiling to listen to offers for the South American after they were demoted to the Europa League after finishing third in Group G.
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