Notts County boss Shaun Derry blamed a "crazy" first-half spell for his team's 3-0 defeat at Oldham.
Oldham secured their first home victory since November with an emphatic 3-0 win against Notts County on Saturday.
Oldham have completed the loan signing of Blackburn goalkeeper Jake Kean until the end of the season.
St Mirren have signed winger James Dayton from Oldham on loan until the end of the season.
Oldham have agreed to extend teenage striker Jordan Bove's loan spell at Colwyn Bay for another three months.
Gillingham's new-found self-belief was behind their second consecutive home win, according to caretaker manager Steve Lovell.
Bradley Dack's deflected volley gave Gillingham back-to-back home wins for the first time since March as they overcame Oldham 3-2.
Midfielder Jacob Mellis has completed a loan switch to Oldham from Blackpool for the remainder of the season.
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