Skysports.com understands Jean Makoun is in Greece for talks with Olympiakos and to undergo a medical.
The Aston Villa midfielder has been identified as a top target by the Greek giants and they are closing on a deal.
They saw an initial approach knocked back by Villa, with Alex McLeish reluctant to part with players without having cover in place.
Olympiakos have, however, returned with a second approach, as revealed by skysports.com on Saturday.
The Cameroon international is now locked in transfer talks, with an agreement believed to be imminent.
Once he has thrashed out personal terms, Makoun will undergo physical tests before putting put to paper.
Should a deal be pushed through, the 28-year-old will leave Villa less than eight months after he arrived from Lyon.