Right now there are still plenty of good players looking for work again after the expiration of their previous contracts.
Here are just a few players out there right now who may attract interest from League One clubs.
Would you like to see any of these players at Stags and if so, why? Let us know via social media.
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9. Josh Onomah (midfield)
Josh Onomah last played for Presnton, He ame through the academy system at Tottenham Hotspur, and was a regular youth international for England, including winning the 2017 FIFA U-20 World Cup and the 2014 UEFA European Under-17 Championship. Photo: Catherine Ivill
10. Florian Kamberi (foward)
Florian Kamberi has previously played for Grasshopper, Karlsruher SC, Hibernian, Rangers, Sheffield Wednesday and Huddersfield Town. He represented Switzerland at the under-21 level, and has since been selected for the Albania squad. Photo: Jacques Feeney
11. Ovie Ejaria (midfielder)
Ovie Ejaria has most recently played for Reading. He is a former England under-21 international. He also had a loan spell with Rangers. Photo: Eddie Keogh
12. Taylor Moore (defender)
Taylor Moore last played for French club Valenciennes. He has good EFL experience with Shrewsbury Town, Cheltenham Town and Bristol City. Photo: Pete Norton