And the Spain international may take advantage of Russia's extended transfer window, which runs until April 8, to depart to 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."
Riera appears hopeful a deal can be concluded in the near future.
"I hope that the question of my transfer will be resolved by this week," he stated.