The Juventus defender sustained a muscle strain in the Euro 2012 final against Spain on Sunday, and now faces a spell on the sidelines after undergoing medical tests
The centre-back picked up a knock in Italy's 4-0 loss against Spain in the final of Euro 2012, and was forced to leave the pitch after only 21 minutes of play due to the problem.
Chiellini has since undergone tests to determine the extent of the injury, and has been diagnosed with a second degree calf strain.
"Giorgio Chiellini was today in Turin to undergo an ultrasound scan after picking up an injury during Sunday night’s Euro 2012 final against Spain," an official statement on the Juventus website reads.
"The defender has sustained a first-to-second degree tear of the medial gastrocnemius muscle in his left calf."
The injury could keep Chiellini out of action for up to five weeks, meaning that he could be a doubt for the Supercoppa Italiana season curtain-raiser against Napoli on August 11.