In the final game of the season, a 4-0 thumping of Belenenses, Grujic struck and he later posted to social media: "Mixed feelings after our last game of the season!
"I felt honoured and privileged to be able to play for this special club.
"A big group of teammates and people around the club. Thanks for everything."
Grujic played 39 games for FC Porto, having scored two goals.
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