Declan Drysdale and Josh Eccles both featured in Gillingham's 2-0 defeat to MK Dons this past weekend.
Drysdale started the game, before being replaced in the 49th minute for John Akinde with the Gills trailing by two goals to nil at the time.
Eccles was amongst the substitutes bench for the start of the game, being introduced to proceedings after 67 minutes.
The defeat leaves Steve Evans' side 8th in League One, a point outside of the play-off places.
Elsewhere, the Icelandic season remains temporarily suspended so Jonny Ngandu wasn't in action and Brandon Mason is still recovering from injury so didn't feature for St Mirren.