On 2 December 2016, McMillan signed a new two-and-a-half-year deal with Motherwell.[2]
On 31 August 2017, McMillan moved on loan to Livingston until January 2018.[3]
Livingston
He then made the move permanent on 19 January 2018, signing until summer 2019.[4] McMillan moved on loan to Partick Thistle in January 2019.[5] He made 16 appearances for the Jags in all competitions in which he featured predominantly as part of a back three.
Partick Thistle return
Three years after his initial loan at the club, on 1 June 2022, McMillan signed a two-year deal with Partick Thistle.[6] McMillan was offered a new contract with Partick Thistle but opted to reject it, resulting in his release from the club at the end of the 2023-24 season.[7]
Exeter City
On 20 June 2024, McMillan made his first foray into English football by signing a two-year deal with EFL League One side Exeter City. The transfer reunited McMillan with manager Gary Caldwell who had originally signed him to Partick Thistle during his initial loan spell.[8]
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