INDIANAPOLIS, July 19 (Reuters) - Indiana Fever sensation Caitlin Clark called for better pay in the WNBA on Saturday as labor negotiations between the league and players intensify, while Commissioner Cathy Engelbert said she was optimistic about their latest talks.

Thousands of fans wearing "Clark" jerseys packed the Gainbridge Fieldhouse for the sold-out All-Star Game on Saturday, while the wildly popular Rookie of the Year was forced to sit out after sustaining a groin injury earlier in the week.

Clark was an omnipresent figure in Indianapolis in the lead-up, despite not being able to play, as her face graced ads for Nike ( NKE ), Wilson and Gatorade that were plastered across the city center.

Asked how those brand deals stacked against her league salary, Clark responded: "That's a good question."

"That's where we're really fortunate is that we have those other deals. I think that's one of the things that we're in the room fighting for," Clark told reporters.

"We should be paid more. Hopefully that's the case moving forward as the league continues to grow. I think it's something that's probably the most important thing that we are in the room advocating about."

The Women's National Basketball Players Association and the league met on Thursday in Indianapolis to negotiate a new collective bargaining agreement after the players voted to opt out of their current deal at the end of the season.

The union said after the meeting that the two sides were far apart on several issues and players were seen warming up for Saturday's game wearing shirts that read "Pay Us What You Owe Us."

Commissioner Cathy Engelbert struck a different tone with reporters, saying she felt the meeting with players had been productive.

"(I'm) really optimistic that we'll get something done, that it'll be transformational, and that next year at All-Star, we'll be talking about how great everything is. But obviously, there's a lot of hard work to be done on both sides," she said.

Engelbert, who also oversaw the league when the last deal was struck in January 2020, has been at the helm during a period of rapid growth for the WNBA, with TV ratings and attendance climbing rapidly.

"We want the same things as the players," she told reporters. "We want to significantly increase their salary and benefits while balancing with our owners their ability to have a path of profitability."