Ireland manager Giovanni Trapattoni revealed that striker Kevin Doyle could miss the remainder of the Barclays Premier League season after suffering a "very serious" knee injury in the 2-1 Euro 2012 qualifying win against Macedonia.
The Wolves forward limped off early on as the Republic moved level with Russia and Slovakia at the top of Group B and Trapattoni fears the 27-year-old may miss the rest of the campaign.
The Italian said: "It's his medial ligament. I think he may be out for one or two months, so it's a very serious injury. But I hope by May or June, he can come back and we can have him for the match in Macedonia."
The Italian boss, meanwhile, hailed Aiden McGeady's best ever performance for his country after an otherwise successful night for his team.
The Spartak Moscow winger got Ireland off to the perfect start with just 85 seconds gone when he blasted home his first senior international goal on his 38th appearance with the help of some hapless goalkeeping by Edin Nuredinoski. Skipper Robbie Keane then pounced on a second error by Nuredinoski to make it 2-0 with just 21 minutes gone.
The Italian had sent out McGeady under orders to shoot on sight, and saw him respond in spectacular fashion.
Trapattoni said: "He was the best player on the pitch. He has improved his performance and his personality. He is very self-confident.
"His first shot at goal, maybe a year ago he would not have done it. I always believed he could do it.
"I said the same to Darron Gibson too. We have players with extraordinary potential, but they are not aware of their potential."
Ireland's victory, coupled with Russia's draw in Armenia and Slovakia's win in Andorra, leaves the three sides locked together on 10 points at the top of Group B