The 24-year-old Welshman is expected to complete a world-record £86m switch to the Bernabeu before the end of the transfer window, although Fernandez Tapias said that Los Blancos hoped to have the deal tied up by now.
"I think it will happen but I cannot make any firm promises," Sky Sports News quotes him as saying. "We're going to wait because they are dragging their feet.
"There are a few problems but I hope they will soon be resolved. We thought that he would be with us now but as of the moment, he is not a Real Madrid player although it looks likely that he will join us."