Northampton manager Keith Curle has made his fourth signing in just 10 days by bringing in striker Harry Smith from Macclesfield.
Middlesbrough are considering rivalling West Brom for Lincoln boss Danny Cowley, Press Association Sport understands.
Veteran striker Jon Stead is among 12 players released by Notts County following the club's relegation from Sky Bet League Two.
Midfielder Ryan Broom has signed a new two-year contract with Sky Bet League Two Cheltenham after impressing in his debut season with the club.
Forest Green Rovers defender Liam Shephard has undergone knee surgery following the Sky Bet League Two club's failure to reach the play-off final.
Port Vale have released nine players following the end of the League Two season.
Lincoln boss Danny Cowley will cost West Brom 500,000 if they want to take him to The Hawthorns.
Northampton have signed former Sheffield Wednesday and Bristol Rovers midfielder Chris Lines.
Carlisle have signed highly-rated England C defender Jon Mellish from Gateshead on a one-year deal.
Carlisle have announced the signing of Christie Elliott after the full-back turned down a contract offer at Partick Thistle.
Mansfield have sacked manager David Flitcroft after the Stags lost their Sky Bet League Two play-off semi-final to Newport.
Newport have been offered use of Cardiff City Stadium to train ahead of the Sky Bet League Two play-off final.
Tranmere manager Micky Mellon praised the quality of James Norwood's strike that took his side to their third successive Wembley final.
James Norwood struck his 32nd goal of the season to help take Tranmere to Wembley for the Sky Bet League Two play-off final against Newport.