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Sylvester Stallone isn’t afraid of much, but going head-to-head with this Hollywood star on screen made the "Rocky" legend sweat.

In a candid interview, Stallone admitted he felt the heat when Samuel L. Jackson signed on to join Season 3 of "Tulsa King."

"When I heard that was gonna happen, I went, 'Oh, this is gonna be a fist fight. This is gonna be a battle,’" Stallone told People . "Like two boxers in a ring, and who is gonna throw the first punch? So you’re getting nervous because you’re dealing with serious competition."

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Stallone, 79, leads the series as Dwight "The General" Manfredi, a mafia capo exiled to Tulsa. Jackson, 76 ,

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