But let's see how closely you were paying attention.
The window has been slammed shut after big-spending from the top teams across Europe.
Out of the 20 top-flight teams, 14 clubs voted in favour of Deadline Day commencing early, and the English Football League could soon follow suit.
Bournemouth were the only club not to spend a penny on additions this month, with the other 19 spending a combined £430m - nearly double the previous record of £225m.
Alexis Sanchez and Jesse Lingard.
Despite all that, the deadline day spending of £150m is a new record and takes the total spending for the month up to £430m - which is an obscene amount of money.
Going out of the Emirates exit were Theo Walcott (£20m to Everton), Olivier Giroud (£18m to Chelsea) and Francis Coquelin (£12m to Valencia).
1 - every club made at least one signing, with Manchester United and Tottenham contenting themselves with a solitary addition apiece - Sanchez and Lucas Moura respectively.
Brazil winger Lucas challenged his new Spurs team-mates to win the Champions League after arriving from PSG for a reported £25 million.
Total expenditure could have been even higher if big-spending runaway league leaders Manchester City, who had already smashed their transfer record by bringing in defender Aymeric Laporte, had persued Leicester's gifted playmaker Riyad Mahrez.
Shaun Harvey, the EFL chief executive, said back in September: "The clubs have been clear in their mandate and we will now go away and look to develop a set of proposals before moving this matter on to the next stage, which would be a formal vote in order to change our regulations". Leicester's protracted move for midfielder Adrien Silva also went through on the same day, and before the week was out Everton had paid a club record £27m to sign Besiktas forward Cenk Tosun.
The Swans said they had re-signed the 28-year-old for a club record but undisclosed fee on a three-and-a-half year contract that will reunite Ayew with brother Jordan at the Liberty Stadium.
Stoke City managed to sign Badou Ndiaye from Galatasaray for £14m as well.
This season, in particular, the 31-year-old has featured as a centre-back for nearly the entirety of the season so far.