Coach Intikhab Alam told reporters that the doctors had prescribed Akhtar at least a week's rest, and hence, he will not be the part of the six-day training camp beginning Thursday.
Alam was hopeful that Shoaib would be available for the Twenty20 World Cup tournament, which begins on June 5.
"I hope he will be fully fit before the all-important event," he said.
Pakistan is in Group B along with Netherlands and England. During the past six months, a series of injuries forced Akhtar to sit out from a number of international matches.
He missed the one-dayers against West Indies in Abu Dhabi last October due to a calf injury, while a knee problem ruled him out of the Tests against Sri Lanka earlier this year.
Shoaib did play the entire limited-overs series against Australia last month, but his poor form was apparent with three wickets at 50.66.