Pakistan captain Misbah-ul-Haq elected to bat after winning the toss against Sri Lanka in the third one-day international in Colombo on Wednesday.
The five-match series is currently tied 1-1, with Pakistan winning the opening one-dayer by six wickets and Sri Lanka winning the second game by 76 runs in Pallekele.
Sri Lanka made one change from the team which played the last game as they rested left-arm spinner Rangana Herath and brought in debutant Sajeewa Weerakoon.
Pakistan replaced paceman Rahat Ali with batsman Asad Shafiq.
Pakistan: Misbah-ul-Haq (capt), Mohammad Hafeez, Azhar Ali, Younis Khan, Umar Akmal, Asad Shafiq, Shahid Afridi, Sarfraz Ahmed, Umar Gul, Saeed Ajmal, Sohail Tanvir.
Sri Lanka: Mahela Jayawardene (capt), Tillakaratne Dilshan, Upul Tharanga, Kumar Sangakkara, Dinesh Chandimal, Angelo Mathews, Lahiru Thirimanne, Thisara Perera, Nuwan Kulasekara, Lasith Malinga, Sajeewa Weerakoon.
Umpires: Asoka de Silva (SRI) and Paul Reiffel (AUS)
TV umpire: Ruchira Palliyaguruge (SRI)
Match referee: Chris Broad (ENG)