The Spanish winger unleashed a volley of abuse on Benitez back in March, and has returned with yet more words of frustration for his under-fire manager.
"I want to leave. English clubs are run differently than Spanish clubs. In England you have a manager at the club, and the board of the club has done nothing for me,” he said.
"The club has not put up any fight for me. I do not want to quarrel with somebody, but if a club doesn't fight for you, that means that they don't want you. I do not want to be in a place where I am not wanted.
"I did not play the last two months and right now my objective it is to go to a club where I can feel appreciated and where I can win trophies. I am not worried about the money now or the country I go to."
Riera has not featured in a Liverpool shirt since his tirade back in March - in which he labelled the club a "sinking ship" - and has been left in the wilderness at Anfield after a proposed move to Spartak Moscow collapsed.
The 28-year-old is still reeling after failing to make Vicente del Bosque’s provisional Spanish squad for the World Cup, a subject the midfielder held significant fears about two months ago.
