The 20-year-old centre-back of Olympiacos, Konstantinos Kostoulas, has attracted interest from several European clubs. According to the well-known journalist Nicolo Schira, De Graafschap is one of the clubs interested in him. In addition to De Graafschap, other clubs such as FC Basel, Malmo, Kortrijk, and HJK Helsinki have also shown interest in acquiring the young defender. Last season, Kostoulas played on loan at Rio Ave in Portugal, where he made three appearances in the league and one in the Cup, also featuring for their B team.