Santi Comesaña has warned Villarreal over the threat Rayo Vallecano pose ahead of Sunday's clash in Vallecas. Villarreal head to the province of Madrid having lost their Europa League opener in Greece on Thursday night, but they did achieve a comeback 2-1 win over Almeria in La Liga last week. Pacheta already knows he has a lot to improve at Villarreal, but what is concerning is the waivering fitness levels of the team, particularly in midfield.