Port-Channel on interfaces in fex-fabric mode

Hello All,

Is it possible to port-channel the interfaces which are in "switchport mode fex-fabric". I know FEX is just a extended line card of Nexus and we just give a fex associate number (like a line card number) but then just wondering if the 2 ports on Nexus connected to FEX can be bundled together to be used as a 20Gig Link.

If cannot be done, could you please someone explain why.

Thanks,

Viki