Sérgio Miguel Relvas de Oliveira is a Portuguese professional footballer who plays as a central midfielder for Süper Lig club Galatasaray. He spent the better part of his career with Porto after making his first-team debut at the age of 17, going on to appear in 174 competitive matches and win three Primeira Liga championships, three Taça de Portugal and two Supertaça Cândido de Oliveira. Wikipedia