Speculation in Spain claims Ramos is furious with Real after they backtracked on contract promises.
The 25-year-old believes he was entitled to a bumper pay rise this summer, but has seen fresh terms fail to materialise.
He is now reportedly prepared to consider offers from elsewhere.
Chelsea and Manchester City have both been linked with big-money moves, and Ramos' brother and agent Rene Ramos has refused to rule out a departure from the Bernabeu.
"Sergio merits better treatment at Real because of the work he has done and his quality," he said in The People.
"It is normal that his talent has been recognised by foreign clubs.
"We have received calls and enquiries but it is in the hands of Real."
Source: Team Talk
Source: Team Talk