Behrami admits he only wanted to leave Upton Park because of personal problems, but has now vowed to give his all for the club with the transfer window now being closed.
"I want to try to help everyone here, the people who have helped me with a difficult moment [in my life]. Now we as a team are in a difficult moment and first two years at West Ham. And they will also do that for the third year," Behrami told the club's official website.
"They know I try to give 100 per cent, sometimes it was good, sometimes not - but if we are all together I feel we can do something good this year. I give everything.
"The club knows I had a personal private problem in my life. I tried to go back to Italy to solve this problem. We didn't find the right solution and I am happy to stay here."