The 20-year-old was sent back to his club by the Lions management to receive intensive treatment to overcome a nagging thigh strain. It was an agonising decision for the youngster, but the decision appears to have worked.
"We have had encouraging and positive news on Leigh's progress all along the line, but the news we have had today is good enough to ask him to join us," said Lions tour manager Gerald Davies.
Halfpenny will take the number of wings available to Ian McGeechan up to five, but his introduction will also mean the Lions gain an extra goalkicking option.
It was his ability to kick goals from the half-way line, as he did in the Heineken Cup semi-final against the Leicester Tigers, that helped convince the Lions selectors he was worth a place.
In the rarified atmosphere of the High Veld, he should be able to give the Lions some real fire power from long range, as well as a strong running option on the flank.
