The PCB has carried out a relentless schedule of COVID-19 tests on all the players and officials selected to travel to South Africa and Zimbabwe and only Hasan had tested positive in the initial tests.
Hasan, who bagged five wickets in the first innings, tormented the Proteas again returning figures of 5-60 and South Africa collapsed to 274 all out after lunch on the last day.
Hasan Ali bowled an absolute ripper to dismiss South Africa's Rassie van der Dussen on the final day of the second Test in Rawalpindi.
South Africa trails Pakistan by 166 runs in a match it must win to draw the series.
The board announced it will provide financial assistance to Hasan, who is currently not a centrally contracted player, till he returns to competitive cricket.
Meanwhile, left-arm pacer Wahab Riaz, who was also left out of the central contract list, is still part of the WhatsApp group.
Hasan has not played for Pakistan since last year's World Cup in England and only appeared in some matches of the Pakistan Super League in February-March before breaking down with the back problem.
Hasan was dropped from the list of contracted players by the PCB on Wednesday along with senior pacers, Wahab Riaz and Mohammad Aamir.
Pakistan's head coach-cum-selector Misbah-ul-Haq defended the axing of senior players like Wahab Riaz, Mohammad Aamir and Hasan Ali from the central contracts list.
Pakistan fast bowler Hasan Ali will miss the Test series against Sri Lanka in December due to rib injury.
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