Hasan Ali has been ruled out of the upcoming two-Test series against Sri Lanka due to rib fractures requiring up to six weeks to heal.
The right-arm paceman has been missing from international duty since Pakistan's World Cup clash against India in June.
He played in Central Punjab's opening fixture of the Quaid-e-Azam Trophy but was sidelined from taking part in further cricket action owing to a back injury.
"Fresh CT scans revealed cortical rib fractures, involving ninth rib on the right side and eighth and ninth ribs on the left side," the PCB stated in a press release.
"The fractures will require up to six weeks to heal and he will start a rehabilitation process at the National Cricket Academy from Monday."
Hasan was set to rejoin Central Punjab for their ninth round clash against Khyber Pakhtunkhwa in the country's premier first-class tournament but was forced to withdraw after complaining about pain on his left side.
The precautionary scans in Karachi revealed fractures, which were later confirmed by the follow-up scans in Lahore.
Hasan, who made his international debut in August 2016, has gradually made his way into becoming a constant member of the Test unit.
Although known for his white-ball prowess, Hasan was part of the team during their three-Test series against South Africa earlier this year.
He has picked 31 wickets in 9 Tests at an average of 28.90 in addition to registering 82 and 35 scalps in ODIs and T20Is respectively.