Charlton youngsters Harry Arter and Ben Godfrey have returned to the Valley after an unsuccessful trial with League Two side Gillingham.
The teenage duo were deemed to be not ready for first-team football by Gills manager Mark Stimson.
Stimson is looking for players that are ready to go straight into the thick of a promotion battle as his side look to secure a place in the top seven come the end of the season.
"They did OK while they were here and we had a good look at them in the reserves, but they have gone back to Charlton now because I don't feel they are quite ready for me yet," he told skysports.com.
"They are still young lads and I didn't think they were ready to be thrust into the first-team here and that is what we are looking for.
"We are at the business end of the season now and we need players to come in and hit the ground running really and they weren't quite ready for that."
The Gills have managed to take four points from their last two games against struggling Bournemouth and Luton, but Stimson believes both those sides have a great chance of avoiding the drop, despite the Hatters' precarious position at the foot of the table.
"I can't see either side going down if I am honest," he said.
"I'm very confident that Bournemouth will stay up and I think Luton have got a great chance of beating the drop as well. I think that because of the players they have in their squads, as they have both assembled a great group of players and I hope they do survive.
"I wouldn't call them struggling sides, I'd call them good sides because they are only down at the bottom end of the table due to points deductions at the start of the season.
"If it wasn't for those points being taken off them they would be in the top half of the table, so to get four points off them is very pleasing because they are two very good sides."