The 31-year-old's current deal at the Bernabeu will expire in 2014 and reports have claimed that the Spanish club are keen to agree new terms with the midfielder.
However, the Spanish international has insisted that no decision has been made regarding his future.
"I haven't yet decided my future. I am signed to Real Madrid until 2014 and that is my situation," Alonso told The People.
Alonso joined Los Blancos from Liverpool in the summer of 2009.