Netflix confirmed the news by posting a new teaser trailer of the show on YouTube.
Both Pena, 41, and Luna, 37, are attached as series regulars. However, the details of their characters are unknown yet, according to The Hollywood Reporter.
The upcoming season will also shift the Colombia-set series to Mexico.
"Guadalajara is not only the birthplace of mariachi and tequila, it's also the home of the newest season of 'Narcos'. Coming 2018," a tweet on the show's official account read.
The first three seasons of "Narcos" focused on the rise and fall of Colombia's Cali cartel and heralded the shift of the drug wars to Mexico.
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