Shoaib has not played for Pakistan since September

Shoaib has had "problems with his travel schedule", but will join the team before the second Test.

Shoaib had a two-year ban for taking nandrolone lifted in December after an appeal panel ruled he had never knowingly taken the banned substance.

He was called up on Monday after Umar Gul was ruled out with an ankle injury.

"Shoaib will not be able to leave before the first Test," said Saleem Altaf, director of cricket operations.

"But he will certainly join the team before the second Test from 19 January."

Gul hurt his ankle in the three-day warm-up game with The Rest of South Africa and PCB communications director Ehsan Malik said: "The team management sent a request to the selectors to rush a replacement."

Pakistan are also without batsman Mohammad Yousuf and all-rounder Shoaib Malik for the match at Centurion Park.

Shoaib, 31, has not played for Pakistan since a one-day game against England in September, a month before he and fellow paceman Mohammad Asif returned positive tests.

"Physically he looks fit and I hope he delivers in South Africa," PCB chairman Nasim Ashraf said of Shoaib.

After his appeal was upheld, Shoaib was left out of the 17-man party after selectors felt he lacked match fitness but he has since bowled 21 overs in a first-class match, taking five wickets.