Sunderland will be one of the clubs looking to make several new signings this summer as they continue their post-season rebuild, and they will be joined by a number of other sides in seeking to assemble a side capable of achieving promotion.
The likes of Portsmouth, Ipswich Town and Wigan Athletic are all set to be active in the market and, indeed, many have already made some eye-catching moves ahead of what they hope will be successful season.
So what signings have been completed in the third tier thus far?
We take a look at all of the deals done in League One over the summer, as clubs begin to dip into the market ahead of what is set to be a hugely competitive 2021/22 season:
1. Accrington Stanley
Ins: John O'Sullivan (Morecambe), Harry Pell (Colchester United) | Outs: None | Released: Joe Maguire, Lamine Kaba Sherif, Jack Bolton, Reagan Ogle, Zehn Mohammed Photo: Lewis Storey
2. AFC Wimbledon
Ins: None | Outs: Joe Pigott | Released: Callum Reilly, Shane McLoughlin, Luke O'Neill Photo: Alex Davidson
3. Bolton Wanderers
Ins: George Johnston (Feyenoord), Dapo Afoyalan (West Ham United), Josh Sheehan (Newport County), Will Aimson (Plymouth Argyle) | Outs: Ryan Delaney (Morecambe) | Released: Sonny Graham, Callum King-Harmes, Arthur Gnahoua, Shaun Miller, Jamie Mascoll, Jak Hickman, Muhammadu Faal Photo: Steve Bardens
4. Burton Albion
Ins: Cameron Borthwick-Jackson (Oldham Athletic), Deji Oshilaja (Charlton Athletic), Omari Patrick (Carlisle United), Frazer Blake-Tracy (Peterborough United), Louis Moult (Preston North End), Bryn Morris (Portsmouth) | Outs: None | Released: Colin Daniel, Jevan Anderson, John-Joe O'Toole, Owen Gallacher, Neal Eardley, Stephen Quinn, Luke Varney, Mike Fondop, Reece Hutchinson, Ben Fox, Tom Armitage, Ben Hart Photo: Naomi Baker