"The suspension is now 18 months, starting Sept. 11, 2023," CAS director general Matthieu Reeb told Reuters.
The France international was provisionally suspended by Italy's national anti-doping organisation (NADO Italia) in September 2023 after testing positive for DHEA - a banned substance that raises levels of testosterone.
Pogba, who has a contract with Italy's Juventus until June 2026, denied any wrongdoing and said in February he would appeal to CAS.
The doping test was performed after Juve's 3-0 season-opening victory in Serie A at Udinese on August 20th, 2023.
The tribunal said it had detected prohibited "non-endogenous testosterone metabolites", adding that the results were "consistent with the exogenous (external) origin of the target compounds."