Hi, I was a welder under 457 visa. In 2011 I have a workplace accident. On May 2012 the Neurosurgeon doctor said I need a C4-C7 (ACDF) which was denied by the insurer. June 2012 my lawyer put the case on the workers compensation tribunal and we won. I had my operation last May 23 2014. The doctor said due to my operation I cannot come back to my job as a welder. As of now I am still on my recovery period when I was terminated due to my visa expiration. I am on the process of applying for medical treatment visa to continue my rehabilitation until the independent doctor can evaluate my impairment. Is it legal under Australian immigration law to terminate a 457 worker for being absent in the workplace while undergoing medical treatment due to a work related injury?