idol“American Idol” is getting closer to assembling a full squad-the show’s zeroing in on finalists to join Katy Perry on the judges’ panel. ‘Idol’ sources tell TMZ .

Lionel Richie’s still a favorite to fill one of the 2 remaining seats, and singer Charlie Puth has emerged as a front-runner for the other one. We’re told show executives will meet with ABC this week to finalize their choices and make offers.

There could be a country curve ball, though sources say Luke Bryan is in the mix because he impressed producers in early discussions. Also, if things don’t work out with 2 of those 3 we’re told Keith Urban is an ‘Idol’ vet who could slide in as an alternate. Katy and Ryan are anxiously waiting to see who joins them.