"He has been advised to take complete rest for the next six months to allow the fractures to heal after which there will be a re-evaluation of his condition," said PCB official Abbas Zaidi.
"Only than will the specialists decide if he needs to go through a rehabilitation process."
The 20-year-old made his debut for Pakistan last year but has not played since the second Test against India at Lahore in April where he took a match-winning five for 31.
He has taken 25 wickets in five Tests at an average of 24.56 and 19 wickets at 27.31 in 15 one-day internationals and is considered one of Pakistan's brightest bowling prospects.
