Sporting CP striker Viktor Gyokeres is a target for Premier League giants Arsenal.
The forward has seen his stock rise immensely over the past two years.
Having previously played in the Championship in England, Gyokeres was signed by Sporting in the summer.
The title chasing team are not eager to sell, as Gyokeres has 15 goals and seven assists in 17 games.
They will direct any team that wants to secure his signature to the player's release clause.
If the 100 million (85.5 million) release clause is activated, Arsenal or any other club can secure Gyokeres' signature.