FC Porto are understood to be interested in wantaway Schalke 04 midfielder Amine Harit.
Harit and the head coach there, Sergio Conceicao, worked together at FC Nantes from 2016 to 2017.
Porto are not the only interested club, though, with Trabzonspor and Galatasaray also said to be keeping tabs on the 25-year-old.
The Moroccan midfielder, who spent last season on loan at Olympique Marseille, no longer seem to have a future at Schalke.
In total, he has scored 13 goals and provided 23 assists in 118 games for 'The Royal Blues' since his €8 million switch from Nantes in 2017.