One of the stars of the 2018/19 National League season, Adi Yussuf
Here are five that Chesterfield and the other 2019/20 promotion hopefuls could consider as potential additions.
Ben Killip has been offered a new deal by Braintree Town. The 23-year-old earned call ups to the England C team this season and won the Supporters Player of the Year award.
Winger Blair Turgott was a transfer target for Chesterfield earlier in the season. The speedster was captain of relegated Maidstone, for whom he fired in 15 goals in 32 games this season.
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Andrew Boyce played more than 40 times for beaten play-off qualifiers Eastleigh this season. The 29-year-old, a commanding centre-half, won promotion to League One with Scunthorpe in 2014.
Adi Yussuf got 17 goals in 49 games for National League runners-up Solihull Moors this season. Unsurprisingly, they've offered him a new deal. The former (whisper it) Stag recently had a call up to the Tanzanian national team.
Goal machine Paul McCallum has confirmed he's leaving Eastleigh, after hitting the net 27 times this season. The 25-year-old has traditionally been based down south.