Jantjes, 29, suffered the injury in a collision with Liam Messam 10 minutes into the Stormers’ Super 14 defeat to the Chiefs at Newlands on Saturday.

Stormers coach Rassie Erasmus confirmed the injury had ended Jantjes’ Lions hopes.

“It is really serious. He is going to be out for a long time,” said Erasmus.

“His leg is broken. I don’t know how serious the break is, but it seemed to me the leg was turned the wrong way round, so it is really serious.

“I just hope he can get healthy as soon as possible. It is bad for him. His Lions tour is gone. It is sad for him and a massive setback for us.”

The injury problems are building for South Africa coach Pieter de Villiers.

Schalk Burger also departed the action in the first half against the Chiefs with a calf problem while centres Jean de Villiers and Adrian Jacobs both missed the weekend’s Super 14 action because of injury.

The Springboks are already without Bath fly-half Butch James, who has damaged knee ligaments.

The Lions fly to South Africa on May 24 with the first fixture against a Highveld XV on May 30. The first Test against South Africa is in Durban on June 20.