Riquelme is training with the first team squad, despite not being wanted by coach Manuel Pellegrini and president Francisco Roig.

Villarreal's Mexican striker Guille Franco fired a chilling warning to Riquelme not to play up: "Riquelme is an extra player and if he joins the squad, then that will be perfect.

"And if he doesn't want to be part of the squad, the squad will ignore him."

Meanwhile, it's been revealed Pellegrini will have to field Riquelme in at least nine games this season due terms in his contract.