I think it will be:
Lisa: Siavash & Marcus
Karly: Siavash & Freddie
Charlie: Siavash & Marcus
Noirin: Freddie & Siavash
Rodrigo: Freddie & Siavash
Sophie: Freddie & Marcus
Marcus: Lisa & Karly
Freddie: Lisa & Noirin
Siavash: Noirin & Lisa
Meaning:
Freddie: 4
Marcus: 3
Siavash: 5
Lisa: 3
Karly: 1
Noirin: 2
Freddie VS Siavash = Very very close battle, however I think Siavash will still be evicted.
There is another possible alternative though, I don't it's very likely but some might vote for Noirin instead of Freddie......but I doubt it.
I'm also not sure if Marcus will nominate Noirin or not........I have a feeling he could after Rabbitgate, he may be running in circles to her face but I think he might be getting fed up of her in reality.