Rivero has admitted his frustration due to a lack of first-team action in recent weeks.
“I am very happy, I have spent four great years here and I have much more to improve and learn, but I want to show it inside the stadium, and if I don’t have the chance to do so I may have to look elsewhere,” the 29-year-old told La Red.
“I always respect whatever the coach says, I support the group from wherever I am. We are all fighting to be in the team and he is the one who decides. I have to be positive however to be happy where I am placed.”
