United are yet to add to Carrick's squad this month, though did make an attempt for Antoine Semenyo before he chose to join Manchester City from Bournemouth.
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"Never say never," Carrick said. "A lot can happen and situations can be thrown up.
"Sometimes it is in our control, sometimes not. I am pretty calm. We have shown what we are capable of as a team."
Meanwhile, on the future of striker Josh Zirkzee, Carrick expects him to remain a United player when the window shuts.
"Josh has just been trying to work to get fit," said Carrick. "It was great to have him training with the group the first time and I am just looking forward to working with him."