Paul Pogba is now a major doubt to play at the 2022 World Cup in Qatar.
The France midfielder suffered a knee injury in training, according to reports.
Pogba, who officially rejoined Juventus earlier this month, will see a specialist consultant to determine what treatment is needed.
The 29-year-old has been diagnosed with a tear of the lateral meniscus in his right knee after limping off the training field in Los Angeles last week.
He was expected to have surgery while in the United States instead of travelling with the Serie A giants as they continue their pre-season tour.
The 2018 World Cup winner, who only returned to Juve just two weeks ago, has instead flown back to Italy to see a specialist.
There are two potential approaches for his injury and one could see him miss the World Cup as it may keep the midfielder on the sidelines until 2023, according to La Gazetta dello Sport.
One option would be to remove a piece of the meniscus, which would rule Pogba out for 40 to 60 days roughly, but that operation is suited to younger players and could affect his mobility.