The 26-year-old, who penned a new deal with the Baggies on Tuesday, is eagerly awaiting the start of the new season after the club secured the signing of Nicolas Anelka
Mulumbu, 26, put pen to paper on a deal on Tuesday that will keep him at The Hawthorns until 2016.
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"I want to play in the best team I can, and I think at the moment West Brom match with that," he told the club's official website.
"Every year we just improve, we've got some decent players at this club like [James] Morrison, Jonas [Olsson] and [Chris] Brunt and if you add some great players like Nicolas [Anelka], I'm looking forward to the start of the season."
West Brom finished eighth under the stewardship of Steve Clarke last season, while local rivals Aston Villa only narrowly avoided relegation, and Mulumbu is eager to retain the bragging rights over their neighbours in the new campaign.
He added: "We're under pressure because at the moment we're the best team in the West Midlands, so we need to show it again this year, and I think we're going to respond on the pitch."