Shane Duffy Martin O'Neill said it would require a "phenomenal effort" for his Republic of Ireland players to beat Serbia on Tuesday.
Valeri Kazaishvili Scotland's hopes of qualifying for Euro 2016 suffered a significant dent after losing 1-0 to Georgia in Tbilisi.
Shane Long The Republic of Ireland could only draw 1-1 with Georgia in Tbilisi to slip two points off leaders Serbia in Group D.
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