''The specialist will carry out orthoscopic surgery to remove floating bodies in both his knees. It is a clean up,'' the PCB's director of cricket operations Saleem Altaf told Reuters today.
''Shoaib is also suffering from a degenerative arthritis related problem, for which another surgery might be required.
''The specialists say Shoaib will require a minimum six to eight weeks to recover from the operation. After which he can resume training.'' Shoaib, 30, who has taken 165 test and 199 One-day wickets, had already been told to rest for around six weeks to recover from a stress fracture of his ankle that has ruled him out of next month's tour of Sri Lanka.
Pakistan is scheduled to play two tests and three One-day internationals against the Sri Lankans. Shoaib also missed Pakistan's 4-1 loss to India earlier this month in the home one-day series.
Pakistan is desperate to have the fast bowler fully fit for the tour of England from late June where they play four tests and five One-dayers.
Atlaf also said pacer Shabbir Ahmed, who received a 12-month ban from the International Cricket Council (ICC) for having an illegal bowling action, was working to correct the problem.
''Shabbir has resumed work on his action under the supervision of test pacer Sarfraz Nawaz in Lahore. We are hoping his action will be modified and improve after this rehabilitation period,'' Altaf said.
Shabbir's appeal against the ban was rejected by a bowling action review group in January.
''Shabbir will also be sent to Australia after his action is corrected for biomechanic tests. We are planning to lodge another appeal to review his action with the ICC before the England tour.''