The period can be notoriously difficult to operate in with teams unwilling to sell their prized assets and demand high.
There will be a number of high-profile deals clubs in the third tier may want to replicate or avoid at all costs.
Click through the list of some of the best and worst League One transfers in recent history.
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9. 2020-21: Ryan Hardie (Blackpool to Plymouth)
After previous loan spells between the clubs, the Pilgrims made his stay permanent in January 2021. This season he has scored 12 goals in all competitions for the promotion pushing Plymouth. (Photo by Stu Forster/Getty Images) Photo: Stu Forster
10. The Worst
The deals League One clubs won't want to replicate this year. (Photo by Bryn Lennon/Getty Images) Photo: Bryn Lennon
11. 2017-18: Kai Brunker (Freiburg to Bradford)
Stuart McCall signed the German striker a few weeks before he was sacked and the forward was a disaster. He scored only twice for the Bantams in two years before their eventual relegation to League Two in 2019 (Photo by Nathan Stirk/Getty Images) Photo: Nathan Stirk
12. 2017-18: Nigel Reo-Coker (Free agent to MK Dons)
The former Aston Villa man ended his career at Stadium MK but never kicked a ball for the Dons. (Photo by Jeff Vinnick/Getty Images) Photo: Jeff Vinnick