AC97 LINE IN Audio Issue (nForce3 Ultra)

Strange one this, i bought a front panel box so i can have a headphone socket and mic in socket on the front of my case as there is none present, now ive got the line outs and mic pinout connected correctly, however the box that i fitted to my 3.5" bay also has a LINE IN socket (blue) i cant find anywhere to connect it on the motherboard (MSI K8N Neo2 Platinum) any ideas?

Does AC97 support line in via the motherboard pins?