The 28-year-old forward was subjected to racist insults during the Portuguese top-flight match on Sunday
Porto forward Moussa Marega said he was ashamed and humiliated after he suffered racist abuse during a Primeira Liga match against his former club Vitoria Guimaraes.
The encounter at the Estadio D. Afonso Henriques which ended 2-1 in favour of Porto, was marred by racist abuse which were directed towards the Mali international.
The excessive insults forced Marega to call for his substitution and almost walked off the pitch, but he was held back by his teammates and coach Sergio Conceicao.