Riera has struggled to cement a regular place in the side this season and admitted to having words with Benitez after being named as a substitute for the opening day defeat to Tottenham.
"I didn't play the first game because I started training late after the Confederations Cup, like Pepe Reina and Fernando Torres," said Riera.
"I was angry and had a flare-up at Benitez, but the day I don't get angry for being a substitute I will retire."
Despite the bust-up Riera insists he has nothing but respect for his manager.
"Benitez is a special coach who defends his own. I know he is with me, because he said so," he added.