The 18-year-old Olympiakos defender attracts the interest of Manchester United as the Red Devils have sent scouts several times to watch his progress.
Manchester United continue to keep close tabs on Retsos as their scout will attend OAKA again this evening to eye Retsos in action against AEK.
Retsos has impressed at Olympiakos since the start of the season under Paulo Bento and Bayern Munich as well have been alerted by his displays.
