Kyle Lafferty has emerged as a doubt for Northern Ireland's Euro 2016 opener against Poland on Sunday after limping out of a training session with his country on Tuesday morning.
It is understood that the Norwich City striker felt his groin while stretching for a loose ball and quickly left the session to undergo treatment at Northern Ireland's training base.
According to BBC Sport, the 28-year-old's fitness for the European Championships is now a major concern.
During qualification for this summer's tournament, Lafferty netted seven international goals. In all, the tall striker has registered 17 times in 50 appearances for his country.
Northern Ireland will compete in their first ever European Championships this year.
Germany
Switzerland
Hungary
Scotland
Spain
Italy
Croatia
Albania
England
Denmark
Slovenia
Serbia
Austria
France
Netherlands
Poland
Romania
Belgium
Slovakia
Ukraine
Portugal
Turkey
Georgia
Czech Republic