"The operation went better than expected according to the doctor," she told Marca. "I want to thank everyone who has shown me love from the first moment.
"There is one day fewer until I return to court," she added. "I will return stronger than ever."
Marin admitted that the injury hit her worse than her first ACL injury, to her right knee in 2019, which saw her sidelined for eight months.
"I was broken because I knew then I would miss the Olympic Games as they are only two months away."
Marin announced on social media on Tuesday (1 June) that she would not be defending her title at the Tokyo 2020 Games in 2021, announcing the extent of her left knee injury after having previously spoken of discomfort last Friday.