Pakistan team manager Haroon Rasheed said Shabbir had returned from Australia with an all-clear report from Australian bowling coach Daryl Foster.
"Basically, Foster has conveyed that there was a 10 to 15 per cent problem with his action which has now been corrected with slight modification," Haroon was quoted as saying by The News.
The Pakistan Cricket Board (PCB) had sent Shabbir to the University of Western Australia in Perth where Daryl Foster and other bowling experts scrutinised his bowling action scientifically and brought about the corrective measures.
Shabbir was reported for a suspect bowling action by umpires Billy Bowden and Darrell Hair during the fifth and final One-day International against New Zealand in Wellington on January 18.
Pakistan coach Javed Miandad said Shabbir's inclusion in the camp was a positive sign as he formed an important part of the bowling attack.
"I think he is the most improved bowler in recent months and we need him to support Shoaib and Sami," Miandad said.
Shabbir said Foster had told him that since his right shoulder was falling backwards in the delivery stride, it gave the illusion that he was throwing the ball. But now Foster has worked on slightly modifying my action specially not allowing the shoulder to fall back," he said.
PCB officials were confident that Shabbir would not have any problems in playing in this month's One-day series against India as ICC had not yet sent them the footage of Shabbir which was found objectionable by the umpires in the New Zealand series.