£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.
The 22-year-old student only landed in the Finnish capital from Japan in the early hours of match-day after a near-5,000-mile journey.
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.
Despite leading HJK Helsinki to Veikkausliiga title glory the Finnish club have opted to replace manager Toni Korkeakunnas .
The Dons defender made the most of a starting berth with a superb goal against HJK Helsinki
The ex-St Johnstone star has three goals in five ICT games - and he's on the manager's wish list for January when his short-term deal runs out.
Adams has taken four points from his two matches in charge, since replacing Malky Mackay at Dingwall.
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.
£500,000 summer signing Pape Gueye was pitched in for his first competitive start against Helsinki but struggled to make an impression.
Defending champions and league leaders can sink Fort's title hopes in crunch Claggan showdown dubbed "the Monster derby".
