Espanyol sporting director Paco Herrera, a former coach and chief scout at Anfield, says the player will only be allowed to leave if someone comes up with the cash.
Liverpool are hoping to land the winger for considerably less after he became disillusioned at Espanyol.
"I want to leave Espanyol," said Riera. "I do not want to be part of a club that does not take care of or protect its players.
"I do not know if I will go to Liverpool or some other team. I am staying hopeful and I would really like everything sorted out within the next two weeks.
"It would be best for everyone concerned because I know that my transfer would clearly be beneficial. I do not want to cause any problems.
"I don't want to be at a club where the supporters have no love for the players, or where it depends on whether the team qualifies for Europe or not."