West Brom are one point and two places above the bottom three.
Foster said: "We're in a dogfight and we have to concentrate on ourselves.
"There are a lot of people (who) say to me from the outside we are too good to get relegated. But that doesn't mean anything really, does it?
"They say over 38 games that if you are relegated then you deserve to be.
"We've got to get on with it ourselves and make sure that doesn't happen. It's all in our hands, we have to crack on."
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