Juventus defender Giorgio Chiellini will miss the start of pre-season training after being diagnosed with a calf injury. The Italy international suffered the problem during last weekend\'s 4-0 defeat by Spain in the final of UEFA EURO 2012. A statement from Juventus read: \"Giorgio Chiellini underwent a scan after sustaining an injury during Sunday night\'s EURO 2012 final against Spain. Tests have revealed a first-second degree muscular lesion in his left calf.\" Chiellini is set to be out of action for four weeks but Juve are hopeful to have the 27-year-old available in time for the Italian Supercoppa final against Napoli on 11 August.