Borussia Monchengladbach 5-2 Aberdeen: German referee pushes Dons' grief to the max
The Pittodrie side tasted a second defeat in their tour of Germany despite Magennis netting a superb 45-yard goal and a late strike from Peter Pawlett.
However, German referee Max Ebbels did the Dons no favours in awarding a penalty against Andrew Considine for holding in the box when no Borussia player complained, giving a Borussia goal that looked yards offside, and Rob Milsom's dismissal for a second booking in injury time.
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Hide AdDons manager Craig Brown is hopeful Milsom will not be suspended for the opening SPL game of the season.
Magennis said: "It was one of the worst referees I have ever had in my life. I couldn't actually believe he sent Rob off. I thought it was just a free kick."
Brown said: "It's usually about five shots per goal, but in their case it was a shot per goal. Every time they shot, they scored."