Derby County forward Jamie Ward is a major injury doubt for Northern Ireland's Euro 2016 qualifier against Romania in Bucharest on 14 November.
Ward is expected to be sidelined for four to six weeks after suffering a thigh strain during his club's 3-0 win at Reading on Saturday.
The striker played in both of his country's recent wins, at home to the Faroe Islands and away to Greece.
The 28-year-old has won 13 caps and has scored two international goals to date.
Ward scored the first goal in his side's 2-0 victory over Greece last week, with the aid of a deflection from a home defender.
Three days earlier, Michael O'Neill's side saw off the Faroes by the same score-line at Windsor Park.
Northern Ireland lie top of qualifying Group F with three wins from three matches as they seek to reach a major finals for the first time since competing at the World Cup in Mexico in 1986.
Romania are their nearest challengers, with two wins and a draw from their opening three fixtures.
Ward has also been in good form at club level, scoring five goals in 12 Championship appearances for the Rams.