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We prove a Tannakian form of Drinfeld's lemma for isocrystals on a varietyover a finite field, equipped with actions of partial Frobenius operators. Thisprovides an intermediate step towards transferring V. Lafforgue's work on theLanglands correspondence over function fields from $\ell$-adic to $p$-adiccoefficients. We also discuss a motivic variant and a local variant ofDrinfeld's lemma.

Drinfeld's lemma for $F$-isocrystals, II: Tannakian approach