His new deal will keep him at the JJB Stadium until 2012.
Bruce added: "It's always hard when you come into a foreign country when you don't know anybody and you can't speak the language but from day one I've been impressed with Maynor's attitude and his professionalism.
"He has done well for us this season and is now getting used to the rigours of the Premier League. I think he can go on to have a great career with us. He's strong, quick and powerful and I think the best is yet to come from him."
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