The Dutchman featured in the FA Cup win over West Ham United.
"I was homesick, but that was mainly in the beginning," admits Büttner. "Everything went well and I'm starting to get used to things more and more here. Many people think, however, that it's easy to just move to another country.
"But I can tell you that it really is not easy."
Buttner says the presence of Robin van Persie has helped him.
"Robin told me that he also struggled in his first year in England. We talk a lot. Also about things outside of football."