By SABC Sport
7th January 2023
Earlier this week, the Sharks - where Kolisi currently plies his trade - confirmed that the Springbok skipper will join the Paris-based outfit after the 2023 Rugby World Cup, which will be held in France later this year.
Alexander feels it's fair that the game's elite players make full use of their earning potential and look after their families beyond their playing careers.
"It's sad to see Siya go," he said. "He's one of the greatest Springbok captains of all time.
"He's done wonderful things for the country but how do you tell a person that they can't go and double or triple what they're earning now?
"Older players need to earn the maximum amount of money they can in the shortest possible period.
"There's life after rugby and, once they stop playing, people forget you very quickly. And then you're on your own and you have to live and you have a family to support.
"I understand why Siya made that decision. But it's really sad to see him go, as with most of our players who go overseas."
Alexander revealed that an imminent SA Rugby private equity deal could open wider revenue possibilities which could allow the governing body to keep its best players in South Africa.
"Once we can be able to sell our properties in pounds and euros, we can sustain and keep our players here," he added.