Writing to an email reply
As per your email, I have been instructed to join office from next working days, though I am not fully recovered from my injuries. I am being told that if I do not join the office then my leave is taken as an unauthorized leave.
I am on sick leave from last Monday due to my bike injuries and I have informed you all about my health condition. Previously, I mentioned in my email that I should return to work from Monday, but as of now, I am not fully able to ride a bike to reach the office from home.
But you are now forcing me to join. If I do not return to the office then my absence in those days are to be considered an unauthorized absence. I have no other option but to return to work to avoid any major problems.
So I have decided to join the office from Tuesday.