Liverpool failed in their bid to sign Fulham's talented teenage forward Fabio Carvalho before the window closed.
The clubs agreed a fee in the region of £8m shortly before the deadline but the final details of the transfer could not be concluded in time.
The deal included 19-year-old Carvalho being loaned back to Fulham.
No deal sheets are used in the EFL and, with the loan back being non-negotiable for Fulham, Liverpool were frustrated in their attempts.
The Portugal-born England youth international has scored eight goals in 23 games for Fulham since making his debut in September 2020.