Probable starting eleven:

Valencia:
Cesar; Joel, Alexis, Albelda, Jordi Alba; Michel, Banega; Pablo, Silva, Mata; Villa

Athletic Bilbao:
Iraizoz; Iraola, San Jose , Amorebieta, Castillo; Susaeta, Iturraspe, Martinez , Gabilondo; Toquero, Llorente

I think this is a perfect opportunity for Bilbao to win. Valencia is in bad form, they lost from Mallorca last Sunday and they were eliminated by Atletico Madrid from UEFA Europe League just one week ago. So, I am sure players confidence is low at the moment. Coach Unai Emeri have very big personal problems as David Navarro, Hedwiges Maduro, Bruno, Lillo, Carlos Marchena, Dealbert, Jeremy Mathieu and Miguel are all out due to injuries. To be the situation even worse, Manuel Fernandes is suspended. So, You realize how bad the situation in Valencia is for tonight game. And I must mention that Bilbao made a lot of problems to Valencia last seasons.Bilbao have four victories in last seven mutual games. Here are the results:

Spanish Primera Division 2009/10     
Ath. Bilbao-Valencia    1:2 - 06.12.2009

Spanish Primera Division 2008/09         
Valencia-Ath. Bilbao    2:0 - 30.05.2009
Ath. Bilbao-Valencia    3:2 - 18.01.2009

Spanish Primera Division 2007/08
Ath. Bilbao-Valencia    5:1 - 20.04.2008
Valencia-Ath. Bilbao    0:3 - 02.12.2007

Spanish Primera Division 2006/07     
Ath. Bilbao-Valencia    1:0 - 07.04.2007
Valencia-Ath. Bilbao    1:1 - 11.11.2006

I think Bilbao have quality and motivation to win even at Mestalla. In case of victory, Bilbao will be just one point from so desired fourth place which means UEFA Champions league participation next season. Of course it won't be easy, but why not.