United boss David Moyes in the market for a new centre-half and fullback.
"There's always going to be a lot of activity and I do expect there's going to be some with us," said Smalling.
"But we'll just have to see how it goes and whoever is playing now will have to make sure they're doing well so they're not replaced.
"There's always pressure when you go out with United. You're expected to win and quite often this season we've not produced but that pressure I thrive on it."
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