Winger Jake Hastie has returned to Rangers midway through a season-long loan deal at Rotherham.
The Sky Bet League One club confirmed an agreement had been reached between the two clubs to end the loan spell early.
The 20-year-old scored in his first three appearances but has only started one of the Millers’ last 12 games.
Rangers’ summer signing from Motherwell made 16 appearances in total, finishing on three goals.
On Jones and Barker, McAllister said: “They are two players that were brought here to try and make a difference, to try and make us better.
“All the coaching staff wanted those guys here. They are two players who we thought could influence games when it’s very, very tight.
“Recently the pair of them have been injured and it’s up to them to show the manager and the management group, they have got to do more to get in the team. If they show us in training, they will get an opportunity. ”
On the prospect of adding to the squad before the transfer deadline, McAllister said: “We are continually looking to improve and at any given moment when an opportunity arises we have got to be there and ready to strike.”
