Arsenal are eyeing Porto midfielder Hector Herrera.
The Mexico international was linked with Olympique Lyon over the weekend, but remains available.
Herrera enjoyed an impressive World Cup and is rated in the €30m class.
Arsenal chiefs are lining up a bid for Herrera - though may be forced to wait with the player on a summer break.
Real Madrid and Barcelona are also both keen, with the midfielder's buyout clause set at €40m.