Here's five things West Ham and Everton fans need to know about Ghezzal.
Transfer battle: West Ham United manager Slaven Bilic and Everton boss Ronald Koeman
Lyon will encourage a bidding war because the 24-year-old is out of contract at the end of this season and has already rejected a number of proposals to extend his stay.
The Hammers are not shy about paying over the odds for players they could sign on a free transfer, though.
Just this week they paid a club record £20.5 million for Swansea City forward Andre Ayew, who Bilic could have signed on a free transfer just last summer.
As you can see here, Ghezzal favours the left
Ghezzal plays predominantly as left winger but can also play in the middle or on the right of the midfield.
His versatility make him an attractive and relatively inexpensive option for both clubs.
From the player's point of view competition for places at West Ham is perhaps more fierce with the likes of Dimitri Payet, Feghouli, Cheikhou Kouyate, Mark Noble, Havard Nordtveit, Michail Antonio, Manuel Lanzini and Gokhan Tore all vying for a place in Bilic's midfield.
Ghezzal has scored nine goals and provided 10 assists in 61 Ligue 1 appearances for Lyron so far.
Eight of those goals and seven assists came last season.
He also scored 10 goals in just over 50 appearances for Lyon's B side prior to being introduced to the first team in France.
Ghezzal has missed a lot of football through injury in recent years with a back complaint keeping him out for over six months.
While he has played for the French Under-21 side, Ghezzal chose to represent Algeria, and scored his first goal for his country against Ethiopia in March.
Lyon boss Bruno Genesio
Lyon coach Bruno Genesio hailed Ghezzal for his ability and attitude last season, saying: “We’ve moved him in to a different position, because the coaching staff felt he’d be able to express himself better in this role.
“But I think the improvement is mainly down to Rachid himself.
"He has reached this level by working hard at his game and by training well every day.”