Italian media reports said Gatti could be out for a month after he was forced off the field in the first half after a clash with Genoa striker Andrea Pinamonti, who missed the ball and inadvertently kicked Gatti's leg.
"The tests revealed the presence of a compound fracture to the diaphysis of the fibula," Juventus said on Monday.
Pinamonti apologised for the incident on social media.
"I am so sorry for your injury, I wish you a speedy recovery and that you can return to the field as soon as possible," he wrote on Instagram.
Gatti, 26, said he will do everything he can to make a quick return as fifth-placed Juventus continue their battle to qualify for the Champions League with a top four finish.
"I will try to be as close as possible to my teammates at this very important time of the season," Gatti wrote in an Instagram story.
--Reuters--