Not only did the Yorkshire club secure permanent deals for the likes of Dan James, Jack Harrison and Junior Firpo, but they also saw numerous players leave on loan or free transfers.
However, one player that the Whites were linked with over the summer that they will now be regretting not being able to sign is Conor Gallagher.
Eventually, the Chelsea youngster stayed in London but ended up at Selhurst Park with the Eagles on loan until the end of the campaign.
Unfortunately for Leeds, the 22-year-old has shown just how much of a mistake the Whites made by not making sure it was them who Gallagher joined in the summer.
With 28 league appearances to his name, the England international has scored eight goals and delivered three assists, leaving only Wilfried Zaha with more goal contributions for Patrick Vieira’s side.
One of those goals ended up being labelled as “outrageous” by Palace podcaster Dan Cook on Twitter.
As well as his efforts in front of goal, Gallagher’s overall performances have been mightily impressive as well.
So much so that WhoScored have him listed as the highest-rated player in Vieira’s squad, as well as the seventh-highest rated player in the entire Premier League excluding Liverpool and Manchester City players.
In comparison to Leeds attacker Rodrigo, the Palace loan star has made more big chances and played more passes into the final third than the Spaniard this season.
To further highlight how imposing the £17k-per-week Englishman has been in terms of creating chances, he’s racked up more shot-creating actions than the likes of Raheem Sterling, Diogo Jota, Phil Foden and Cristiano Ronaldo.
Taking all of this into account and with some of the difficult results that Leeds have picked up at times this season, having a player like Gallagher – who is now reported to have an asking price of £50m – in their ranks could have been a massive boost for the Whites.