ET talked to the CBS star at the 2017 SAG Awards.
Jim Parsons knows who will play young Sheldon on The Big Bang Theory spin-off... but he's not ready to reveal it just yet.
The 43-year-old actor spoke to ET's Nancy O'Dell at the 2017 Screen Actors Guild Awards, where he remained tight-lipped on who the lead would be in the upcoming series surrounding his Big Bang character's younger life.
"We do," Parsons responded, when asked if a lead had been chosen for the show. "They're supposed to release it but I'm not going to say."
EXCLUSIVE: Jim Parsons Dishes on Sheldon's 'Big Bang Theory' Spinoff and Diving Into Political Radio
Parsons did reveal, however, that the kid is a gem!
"He's wonderful," he shared. "So many kids sent in [tapes] and it was really overwhelming. But this one little guy was really special."
"Chuck Lorre, Steve Molaro are really heading it but they're always really sweet about asking, 'What would you think?' and I'm like, 'I think it's great,'" he added, regarding his role in the casting process. "I kind of don't want to get in the way too much because whoever the kids is has to do his own thing. You know what I mean? If it's going to be special it has to be related to what's going on but also it's own creature, you know? I'm excited about it though."
WATCH: Howard and Bernadette's Baby Arrives on 'The Big Bang Theory'
Parsons recently opened up to ET about the spin-off series in NYC, while promoting his new SiriusXM radio show, Jim Parsons Is Too Stupid for Politics, where he offered some surprising advice for the young actor to step into his shoes.
"I would advise that actor to watch me as little as possible, and take that thing by the horns, and make it your own," he said.
Well, Sheldon knows best!
WATCH: Jim Parsons Celebrates 14-Year Anniversary With Sweet Throwback Instagram