Juventus defender Giorgio Chiellini has broken down in preseason.
Chiellini suffered a thigh injury in their 2-1 win over Lechia Gdansk.
Juve coach Max Allegri said, “We'll see, as he felt the muscle harden in his thigh.
"Unfortunately at this moment we have to speed up the training process to be ready for August 8 in Shanghai and that means taking a few more risks than we usually would."