£500k summer signing Gueye and youth academy graduate Milne were named in a competitive Dons line-up for the first time in the Europa Conference League clash at the Bolt Arena.
Dons legend Harper believes centre-half MacDonald showed plenty of reasons to suggest why he deserves a starting berth in Sunday's match against Hibernian.
Premiership fixture at the Tony Macaroni Arena faces a morning check as Derek Adams seeks to build on his unbeaten third stint at Staggies boss, while Highland League leaders Brechin City's game at Forres is off.
In this week's column, Rachel discusses Scotland's must-win Nations League matches against Belgium and England and why Aberdeen Women's heavy defeat to Celtic is a poor reflection on the club.
As the temperature plummeted to -17C and the snow fell Dons supporters were warned the game would be abandoned if they continued to throw snow balls onto the pitch.