Aberdeen coach Stephen Glass has admitted the club will reassess Matty Longstaff's situation in January.

The Newcastle United midfielder, who is on loan at Aberdeen, was left out of Saturday's clash with St. Mirren.

Asked about the 21-year-old's omission against St Mirren, Aberdeen manager Glass said: "Matty's still competing to be in this group until January, then we'll see where we are.

"The one thing through the whole thing is Matty's attitude has been brilliant. He knew he wasn't getting stripped (against St Mirren). After he asked me that, he went away and did some work on his own.

"Matty's working his tail off to try to get back, because the training has been limited the last couple of weeks in terms of a group and football work."

Glass added: "We constantly speak to their loan managers.

"There's a recognition that these are young players are coming to compete in a decent team here.

"There's a tough group of professionals to break your way into here. There's a constant discussion. The clubs are happy with where those players are, what they're getting – and the fact they have to compete to earn time on the park.

"They need to earn the right to play in the team. If they do that, they'll play."