Rashford is currently on-loan at Barcelona, which hold a €30m permanent transfer clause.
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"There's decisions to be made on certain things, and obviously Marcus is in that situation," said Carrick.
"But at this point in time, nothing's been decided.
"It will be, because it has to be at a certain point, but at this stage, there's nothing to say."
Carrick added: "Whoever's here, I want to work with, and help them improve.
"At the moment, it's this squad of players. There's obviously players on loan, and whatever happens with that later on will happen.
"But certainly, as a coach, and leader of a squad, we want to get the best out of everyone."