West Ham and Everton remain interested in Leonardo Koutris but FC Porto have also entered the race, according to reports in Portugal.
Portuguese newspaper Correio da Manha (via Sport Witness) claims that these three clubs will compete for Koutris in the summer.
Olympiacos rate the left-back at more than €10m, which means that West Ham might need to spend around £9m to land their man.
The Hammers could be hunting for new full-backs this summer with Manuel Pellegrini identifying that as a problem area.
Arthur Masuaku and Aaron Cresswell currently share the left-back duties. But both have dipped in and out of form so a new left-back could arrive this summer.
Who is Leonardo Koutris?
Olympiacos signed Koutris from fellow Greek side PAS Giannina in 2017 and he has since played over 50 times for the club.
The Greece international, who was born in Brazil, has Champions League experience under his belt during his time with Olympiacos.
Koutris is perhaps best-known for a comical moment which went viral. He was involved in an incident where he was dropped off a stretcher twice while playing for Ergotelis.
In terms of his football, the 23-year-old is regarded as a modern-day full-back. He is good going forward but there are still question marks over his defending.
In that regard, he sounds like another Masuaku, who – ironically – West Ham also signed from Olympiacos. But Everton and Porto are also linked. Lucas Digne needs a back-up at Goodison Park while Porto want him to replace Alex Telles.