West Brom striker Shane Long is set for six weeks on the sidelines recovering from the knee injury he sustained in the 2-1 win at Aston Villa.
Baggies manager Roy Hodgson claimed Republic of Ireland international Long was lucky not to have "two broken legs" following a challenge from Alan Hutton.
Scans have revealed severe bone bruising and a small bone chip inside his right knee.
Long will now miss his country's Euro 2012 play-off with Estonia.
The forward, who joined from Reading in the summer, would have been sure to play a key role for Giovanni Trapattoni's team in the double header on 11 November and 15 November.
But he will now be absent until West Brom's trip to QPR on 3 December at the earliest.
Hutton's two-footed lunge forced Long to limp off the pitch during the first half at Villa Park.
"It will be very interesting to see what the experts think but I thought it was an appalling tackle," Hodgson said after the match.
"Shane's lucky not to have two broken legs. He has a serious knee injury I would think."
Hutton escaped unpunished for the incident, with his manager Alex McLeish defending the challenge.
McLeish said: "Hutton got to the ball first and it's difficult for players to pull out of challenges like that."