Pogba in injury
This morning he trained for the second time but then stopped and it was then decided that he undergo surgery. We will realistically get him back in January," Allegri told reporters before Tuesday's Champions League clash at Paris Saint-Germain.
Allegri was unsure if Pogba would be ready for France's World Cup defence, which begins in November, adding: "The World Cup is not my problem, Juventus' problem is that he comes back in January."
Pogba was instrumental in France's World Cup victory in 2018 in Russia, scoring in the final where they beat Croatia 4-2. He has scored 11 goals in 91 appearances for France.
Juventus and PSG are in Champions League Group H with Benfica and Maccabi Haifa. Allegri said his side would need at least 10 points to qualify for the knockout stages, adding that PSG are one of the title favourites.
