Riaz and Gul were surprisingly rested while Tanveer Ahmed dropped for the tour which includes one Test, three one-day internationals and two Twenty20 matches, starting later this month.
The 15-man tour party includes four inexperienced pacemen in Sohail Tanveer, Sohail Khan, Aizaz Cheema and Junaid Khan, a strategy Wasim fears may backfire on Pakistan.
"I don't mind taking Zimbabwe lightly and giving chances to youngsters but it is surprising that you rest Riaz who has just started his career a year ago and is progressing. He doesn't need rest," Wasim told AFP.
Gul, Wasim said, would have found his lost form in Zimbabwe.
"I have seen that out-of-form paceman get back to form by playing easier teams, but here we have rested the two main pacemen and they were allowed to play county cricket, instead of doing the national duty," said Wasim.
Riaz represented Kent while Gul played for Sussex in the Twenty20 league in England.
Wasim described Riaz as Pakistan's future.
"The idea to groom a young paceman is to give him more and more opportunities and not to rest him," said Wasim, who took 414 Test and 502 one-day wickets during his illustrious career.
"Riaz needs opportunities and it's not wise for him to rest at this stage."
Wasim said teams like India and Australia who played continuously could rest key players.
"If we see India giving rest to their key players, its understandable because they play too much cricket throughout the year but Pakistan rarely plays Tests and here we are without our rising paceman," said Wasim.
The 26-year-old Riaz, a left-armer like Wasim, has so far played seven Tests since making his debut on last year's tour of England. He has also played 22 one-day internationals.
Wasim praised Cheema's selection.
"Cheema has been leading wicket-taker in Pakistan's domestic season, so he deserved a chance but there should be more consistency in selection," said Wasim.
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it is also surprising that PCB did not include Tanvir Ahmed who took key wickets in all three tests he played. He too is a good one line bowler who bowls intelligently.......how cruel....
It is high time that they should revamp the PCB!
As i see it, Pakistan's team cricket can only post a threat to the Zimbabwean and Bangladeshi teams.