[5] Motherwell announced their fourth signing of the summer on 6 June, goalkeeper Trevor Carson from Hartlepool United on a three-year contract.

[11] Young striker George Newell signed a one-year contract with Motherwell on 24 July,[12] with Ellis Plummer joining on 2 August.

[22] On 14 December, Motherwell announced that they had agreed to the transfer of Louis Moult to Preston North End for an undisclosed fee on 1 January 2018.

[35] On 21 May, Motherwell announced that Russell Griffiths, Ellis Plummer, Deimantas Petravičius, Luke Watt and Dylan King would be leaving the club at the end of their contracts, whilst Tom Aldred, Stephen Hendrie and Nadir Çiftçi would be returning to their parent clubs after their loan deals had expired.

Shea Gordon, Adam Livingstone, Barry Maguire, James Scott, P. J. Morrison, Jason Krones, Jordan Armstrong, Shaun Bowers and Alfredo Agyeman were all offered new contracts.

[36] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.