Injury has forced Derby forward Jamie Ward and Liverpool defender Ryan McLaughlin to withdraw from Northern Ireland's squad to face Romania in a Euro 2016 qualifier.
Ward has not played since 18 October because of a thigh problem while McLaughlin is suffering with a groin injury.
Heading into this week there were concerns over Southampton midfielder Steven Davis, who reported a hamstring problem at the weekend, and Fulham defender Aaron Hughes (ankle) but so far there has been no update on their chances of being fit for Friday's match.
Rochdale midfielder Matthew Lund and Oldham defender Carl Winchester have been called up to the squad for Friday's game to cover for the withdrawals.
Brentford's Stuart Dallas had been on the standby list but he was unable to join up with the squad due to fitness reasons.
Winchester, 21, has a solitary cap to his name from 2011 and returns to the senior set-up following a string of impressive performances with Oldham and Northern Ireland's Under-21s.
Speaking to Latics' official website, manager Lee Johnson said: "I'm delighted for two reasons as he can still play on the Saturday for us because if he is not involved with Northern Ireland, he can come back and play.
"I'm delighted for him and the club because to have a player come through the youth system is excellent. Supporters can see the path he has come from to become a full international and it is fantastic for Carl and the club."
Lund, 23, has received his first senior call-up after helping Rochdale make a promising start to life in the third tier.
