"We have a panel of bowling experts also to look into such cases. But we feel Waqar is the best person in this situation to help Shabbir," PCB chief executive Rameez Raja said.
Shabbir was reported for a suspect bowling action by umpires Darrell Hair and Billy Bowden after they reviewed footage of the fifth and final one-day international against New Zealand at Wellington.
The 27-year-old was reported twice by International Cricket Council (ICC) match officials in 1999 after one-day tournaments in Toronto and Sharjah.
Shabbir, who can continue to play at this stage of the investigation, has six weeks to work on any areas of concern before the PCB board sends a report to the ICC.
Fast bowler Waqar was sacked as captain and dropped from the Pakistan team after last year's World Cup.
