The 18-year-old Colombian was rushed to hospital after losing consciousness.
The distressing scenes were captured on video.
Caicdeo, considered by many to be a star of the future, is unlikely to feature again in the showpiece tournament.
She has been released from hospital.
‘What happened was just a symptom of all the stress and physical demands of a World Cup,’ a team official said.
Caicedo successfully battled ovarian cancer as a 15-year-old, undergoing surgery to remove a tumour and six months of chemotherapy.
Oof! It’s really happening daily now!
World Cup star Linda Caicedo, 18, grabs her chest and collapses at training in Sydney before being rushed to hospital in an ambulance after losing consciousness pic.twitter.com/QPZQwp5bXP
— aussie17 (@_aussie17) July 28, 2023