I am writing to tell you that I have recovered from my recent appendicitis. I will come back to my post next Monday. I am looking forward to working with you again.
Many thanks for your comfort and support during my sickness.
I am happy to hear that you have recovered and you will come back. You can't imagine how much we miss you. We are all expecting to meet you in great form.
I am happy to hear that you have recovered and will come back next Monday. Our colleagues asked me to extend their warm welcome to you on behalf of them. We can hardly wait to see you again.