Fitting Citrix Netscaler with Ironport

Hello,

Currently we have Exchange 2010 environment and mail flow as below;

1 CAS

2 MBX

Internet --> Ironport --> CAS --> MBX

We are planning for Exchange 2010 to 2013 upgrade and I am preparing a plan for it.

We already have Internet facing Ironport as mentioned above.

We also have Citrix Netscaler as internet facing for accessing citrix applications.

Exchange 2013 plan

2 CAS

2 MBX

I want to load balance CAS servers with Citrix Netscaler. 

How should I fit in Netscaler in the design.

Please suggest

Thanks,

Mihir