The Spaniard has been frozen out at Liverpool after launching an attack on manager Rafa Benitez last week.
Riera could join Spartak Moscow on loan.
“Russia presents a very interesting option for me,” Riera is quoted as saying in Russian newspaper Sport Express.
“For one, it’s the only prestigious league in Europe where the transfer window is open.
“And secondly, if I play there regularly, I may be able to earn my ticket to the World Cup in South Africa.”
