Northern Ireland manager Michael O'Neill has been forced to reshape his squad ahead of Tuesday's World Cup qualifier against Portugal.
Hibernian centre-back James McPake (Achilles), Hull City defender Joe Dudgeon (knee), Newcastle midfielder Shane Ferguson (hip) and Burnley striker Martin Paterson (ongoing fitness issues) have all been ruled out of the Group F game in Porto.
Burnley full-back Danny Lafferty, Watford defender Lee Hodson and Bradford City defender Rory McArdle have been drafted into the squad as replacements.
Former Derry City left-back Lafferty, 23, won his first full cap for Northern Ireland in a friendly defeat to Holland at the end of last season.
Hodson, 21, has made nine appearances for his country, while McArdle, 25, has been capped five times.
Northern Ireland have picked up one point from their two Group F games so far and are yet to win since O'Neill took over the reins from Nigel Worthington in February.
Portugal have a 100 per cent record in qualifying although they have not been particularly impressive in beating Luxembourg 2-1 and Azerbaijan 3-0.