Northern Ireland have lost three more players to injury ahead of Saturday afternoon's friendly with South Korea at Windsor Park.
The trio have each been sent back to their respective club sides to receive further treatment, ruling them out of this weekend's clash.
Speaking at his pre-match presser, boss Michael O'Neill said: "We have to be careful with the players given the time of year it is and the nature of the game.
"The game will provide an opportunity for some of those players like Jordan Jones and Jamal Lewis and one or two others. The U21s play on Thursday so there is always the opportunity to add one or two of those players from that squad into the senior game as well.
"If an U21 player or players come in, it won't just be for the experience - it will be because we believe they can contribute as well. They also have a game on Monday so we also have to balance that."
O'Neill's men are without a win in five matches, losing three and drawing one of those.