"I am very happy to be at West Ham and look forward to scoring more goals and doing everything I can for the team."
Boa Morte, who signed for £5m from Fulham in 2007, said: "To be honest I did have more options and more offers from other people, but I wanted to stay here.
"When the season finished a few clubs came to me about signing for them but West Ham believed in me and things are looking positive here."
He added: "We have a new manager and I have seen he has done good things with Chelsea and Portsmouth, reaching major finals twice. The fans also had an impact on my decision to stay and I look forward to playing for them again."
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