Although traditionally, the period for moving in the market runs until the end of January, deals can be struck up to 23:00 GMT on Monday 3 February.
At the time of writing, there have, so far, only been outgoing loans at United. Ethan Ennis (Doncaster Rovers), Joe Hugill (Carlisle United), Ethan Williams (Cheltenham Town) and Ethan Wheatley (Walsall) have all departed on a temporary basis.
While this window is not often seen as a busy time for transfers, compared to the summer, there is, as usual, much speculation in the media about rumoured incomings and outgoings.
Head coach Ruben Amorim has made it clear he will not discuss the topic and said at his most recent press conference that he will only talk about things when the deadline has passed.