zero phase filter in simulink

I am trying to run a zero phase low pass filter in Simulink in MATLAB however I can't find a zero phase filter block. The function filtfilt() works however when i use a self defined function block in Simulink with the same code that works in MATLAB it doesn't seem to work in Simulink. I have attached an image of the Simulink model and the code itself.

function y = test_lp(u)
   Wn = 0.01*5;
   [b,a] = butter( 3, Wn, 'low');
   data=u(:,2);
   y= filtfilt(b,a,u(:,2));
   %y=filtfilt(b,a,u);
end

Answer 1

[Sameer Gadekar]

Any filter will introduce and has to introduce delay in the output else filter will become instable it wll become non causal.

Answer 2

[Rafael Cordero]

Im having the same problem. Did you ever figure out how to fix this?