But while the rest of his teammates were out on the field or sitting on the bench, one man stayed behind. Canterbury enforcer David Klemmer was shown hugging a visibly distressed Stanley, consoling him by holding him tight and speaking words of encouragement in his ear.
The heartbreaking vision clearly had an impact on viewers.
"The poor young bloke is gutted, what a nightmare run of injuries he has had," said Fox Sports commentator Andy Raymond.
"100 games up tonight, unfortunately it ends like so many have in his 10-year career," said Warren Smith.
"It's a great shame."
Since debuting for the Dragons in 2007, Stanley has had issues with his shoulders, knees and elbows. As bad as that sounds, he's actually not the unluckiest member of his family.
Younger brother Kyle retired last year at just 24 years of age because his body could not keep up with the rigours of playing rugby league. He underwent five knee reconstructions since breaking into first grade - also with St George - in 2010.
- news.com.au with AAP