Everton midfielder Darron Gibson will be out for four to five weeks with a thigh strain, manager David Moyes has confirmed.
The 24-year-old, who has figured in all three of the Toffees' Barclays Premier League matches so far this season, could be sidelined for as many as six games.
Gibson recently told Republic of Ireland manager Giovanni Trapattoni he was still suffering from the disappointment of playing a limited role at the Euro 2012 finals and did not want to be considered for selection in their World Cup qualifying campaign.
"Darron's got a thigh strain and will probably be out for four to five weeks," said the Scot.
"He's had two weeks now so hopefully we are a couple of weeks down the line already because of the international break so he may have only a couple of weeks to miss.
"It is a concern for me because he has been very consistent and very good.
"It is a blow but we will have to find ways of getting around it."