Tillakaratne Dilshan said the pair will arrive in the next couple of days ahead of the second Test.
Centurion: Seam bowlers Nuwan Kulasekara and Dhammika Prasad will join Sri Lanka's squad in South Africa to boost the tourists after they fell to a heavy loss in the first Test on Saturday.
Captain Tillakaratne Dilshan says the pair will arrive in the next couple of days ahead of the second Test in Durban, which starts on December 26. Kulasekara and Prasad are both returning from injury layoffs.
Sri Lanka struggled with a host of injuries to fast bowlers ahead of the three-match series in South Africa, where it has never won a Test.
Sri Lanka lost by an innings and 81 runs inside three days in Centurion to go 1-0 down ahead of Tests in Durban and then Cape Town in early January. The Sri Lankans have now gone 15 Tests without a win.