Andrew Little and Josh Carson have been called up to Northern Ireland's squad to face Estonia in Tuesday's Euro 2012 qualifier.
Their inclusion comes after brothers Corry and Jonny Evans were suspended for the match following their bookings against Serbia on Friday.
Little is currently on loan at Port Vale from Rangers, while Carson is signed with Ipswich Town.
Nigel Worthington's side sit fifth in Group C and must win in Tallinn to stand any realistic chance of making the play-offs.