Gautam, however, also thinks that the two need to check their temper if they want to survive in the Bigg Boss house.
The 27-year-old actor will be seen tomorrow on the show as a panelist.
"Mandana and Rochelle are my favourite in the house. They are good looking girls, speak well, put efforts during tasks and also have innocence.
"They can't take much nonsense and get angry easily. They react. Mandana can win if she stops reacting.. She gets angry and becomes stubborn. Rochelle also has the qualities to go to the top," Gautam told PTI.
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"I think Aman can give strong competition to Rochelle and Mandana. It wouldn't be surprising if Aman wins the game. He went bald during a task and that's a big thing for an actor. That shows his dedication towards the show. Mandana, Rochelle and Aman should go till the end," he said.
Gautam feels actress Kishwer Merchant "nags" a lot and as a viewer he does not enjoy that.
"I don't have any personal problem with anyone. I don't know many of them. But I don't like how Kishwer nags. She screams while talking and I don't think that's a good way to talk. Also, it is not nice to spit in someone's drink. All this does not make you a hero."
When asked his view on this season's contestants, Gautam said, "People don't really know what to do, which is good too as that allows you to be yourself. But they are not letting their true personalities even after one month.
"Also, I feel entertainment quotient should be upped. This time contestants leave the task in between, while we used to do for hours.