Opener Imran Farhat has pulled out of Pakistan's tour to Zimbabwe for personal reasons.
He has been replaced by the uncapped Shan Masood, a left-hander who has been scoring prolifically in domestic cricket and has been a regular for the 'A' team.
A PCB statement said: "Farhat has informed the Board and the national selection committee that due to domestic matters which require his immediate attention he will be unable to proceed to Zimbabwe with the team.
"The selection committee has consulted and Masood has been selected to replace Farhat in the Test Squad."
Farhat, 31, had been named in the Test phase for the tour which starts on August 23. Pakistan will play two Twenty20s, three one-day internationals and two Tests.
Farhat has so far played 40 Tests for Pakistan, the last of which was in South Africa in February this year.
Pakistan Test squad: Misbah-ul Haq (captain), Mohammad Hafeez, Khurram Manzoor, Shan Masood, Asad Shafiq, Younis Khan, Azhar Ali, Faisal Iqbal, Adnan Akmal, Junaid Khan, Wahab Riaz, Ehsan Adil, Rahat Ali, Saeed Ajmal, Abdul Rehman.