The Spain international started the match on the bench and was visibly upset at the final whistle.
Riera said: "I was again a substitute. I am not going to be the one that gets upset now and complains because the only one who would be harmed would be myself.
"It is true that nobody can guarantee a place to me, for that reason I am not surprised to be substitute for another week.
"I still have dreams of going to the Euros."