It was feared the singer could lose his eyesight or voice following the treatment, however Giles Baxendale, Watson's manger, insists this does not appear to be the case.
And 41-year-old Watson has thanked his family, friends and fans for their support during a tough time.
Writing on his blog, he says, "I'm not out of the woods yet. I dearly wanted to keep the side-effects to a minimum and I've been keeping myself fit and healthy as I can, but I'm afraid they've caught up with me, and I don't mind admitting I've not been myself.
"I'm just so lucky I've had friends, family, and of course my fans to help me through; I really don't think I could do this without the support I've had."
Watson had surgery on the tumour - which grew close to his optic nerve - last October (07), his second operation on the cancer in 12 months.
Source: WENN