"I would love to have them all on," Aaron Korsh said of his 'Suits' alum, but "I don't want to have them all on one after the other because I think it harms the original and the new show to do that."

Characters from the original series will be making appearances on the spinoff, including original series star Gabriel Macht – set for a three-episode stint as Harvey Specter. Macht has not yet filmed his scenes, so will appear later in the season, and it took some convincing to bring him on board.

"I'm not interested in continuing on. The story is done, and we had a really good ride and all of that," Macht tells EW.