CBS has yet to renew TV's no. 1 comedy hit sitcom "The Big Bang Theory" since the main stars of the show have yet to renew their contracts. But with negotiations coming to a close, the network is expected to announce a two-season renewal soon.

"We have established hits including the number one drama 'NCIS,' and the number one comedy 'The Big Bang Theory' – which, by the way, we are very, very close to renewing for two more years," CBS CEO Leslie Moonves told investors last Wednesday, at the company's fourth quarter earnings call.

Sources told The Hollywood Reporter that "The Big Bang Theory" main stars — Jim Parsons, Johnny Galecki, Kaley Cuoco, Simon Helberg, and Kunal Nayyar— are close to renewing their contracts for the following two seasons. In addition, sources told the news outlet that Parsons, Galecki, and Cuoco, who previously clamored for a pay raise, will still have their current rate, which is at $1 million per episode. Meanwhile, Helberg and Nayyal, will be bumped up to their category when a new season opens.

As for Melissa Rauch and Mayim Bialik, the pair have also secured raises before, but they are also expected to land an even bigger rate now that they are regular members of the show, and are equally as important to the show's overall storyline.

"The Big Bang Theory" is currently on its 10th season. On the latest episode of the series, titled "The Allowance Evaporation," Sheldon (Parsons) and Amy (Bialik) had their first big fight as a couple. Amy found out that Sheldon had been telling his colleagues at the university about their relationship agreement, which most people would find absurd. But what got Amy flustered was how Sheldon blabbed about an intimate part of their relationship, about them sleeping together once a year.

"The Big Bang Theory" season 10 airs on CBS every Thursdays at 8 p.m. EST.