The cast of “Big Bang Theory” Season 10 are currently in talks to star in more seasons for the hit CBS TV series.

In an interview with Variety, CBS entertainment president Glenn Geller confirmed that negotiations are currently ongoing. “We are guardedly optimistic that we will make a deal,” he said. Geller also clarified that there is no concrete timetable to complete the negotiations for three “Big Bang Theory” cast members, namely, Jim Parsons, Kaley Cuoco and Johnny Galecki. But when asked if the sitcom can return without the three lead stars, Geller simply said that their goal is to have the entire gang return for Season 11.

Parsons, Cuoco and Galecki had their contracts renewed in 2014. At that time, all three of them were given a hefty salary increase of $1 million per episode for an average total of 24 episodes per season. As of late, it is unclear whether or not the three would demand for an increase in their pay. Previously, Parsons and Cuoco already expressed their desire to still be part of the sitcom for more seasons. While speaking with TV Line in August 2016, the actress said, “I think it’s a given that we want to be here. That’s the overall consensus. It might be a sticky road, but if I have anything to do with it, we’d be here for much longer. That’s the goal.”

Parsons also told the publication in March 2016 that he couldn’t imagine how any of his co-stars will say no to return to “Big Bang Theory” after Season 10. He added that if any one of them will be interested in leaving, it will most definitely not be after Season 10 and before Season 11.

“Big Bang Theory” Season 10 airs Thursdays at 8 p.m. EST on CBS.