The Norwegian defender and the French midfielder were not part of the Hoops squad registered with UEFA before their clash against the Danish team at Parkhead.
Ajer has had a fitness issue, but it has been heavily linked with a move to Brentford as there was speculation about the future of Ntcham, who was loaned to Marseille in the second half of last season .
Asked about the Norwegian following Saturday’s 1-0 loss to Preston, Celtic boss Ange Postecoglou said: “I am focusing on those involved.
“I can’t afford to waste time with someone other than those who are here and have made a commitment to be here. “
Recent rookie Osake Urhoghide is part of the Postecoglou squad, but new hires Liel Abada and Kyogo Furuhashi have not been included.
Celtic have the option of adding two players to the squad before midnight on Monday.
Griffiths vying to take on Midtylland
Leigh Griffiths is back in contention for Celtic’s qualifying game against Midtjylland on Tuesday night.
The 30-year-old striker was sent home from Hoops training center in Wales earlier this month as police and the club investigated his social media activity.
Scottish police said they had established “no incrimination” after conducting a “full assessment” of allegations Griffiths exchanged inappropriate messages with a 15-year-old girl, as well as another teenage girl on the social networks.
Ahead of the Danish side’s visit, Celtic boss Ange Postecoglou said on Monday: “He [Griffiths] is ready to go.
“I think I’ve said it before, the whole process with Leigh was pretty straightforward for me.
“Obviously, with regard to the incident, other people took control of this investigation and, from what I understand, everything has been sorted out to understand what happened.
“From there he was made available and that’s when he came back into my consciousness as a footballer.
“And I’m not the type to absolve myself of responsibility for things but, with a limit of 24 hours a day and the number of things I have to focus on, I decided that I would focus on things. that I can control.
“And once Leigh comes back to the squad and everything’s been sorted out regarding the incident, he’s back as a Celtic player, back with the squad and available for selection tomorrow. “
The winners face PSV or Galatasaray in the third qualifying round
Celtic will face either PSV or Galatasaray if they beat Midtjylland in the second qualifying round.
Celtic aim to reach the group stage for the first time in four years, but they must first beat the Midtjylland Danes in their second round-trip qualifying round before facing either PSV or Galatasaray.
The first leg of this meeting will take place at Celtic Park on Tuesday night and will be Postecoglou’s first competitive game as Celtic manager.
Celtic will be absent in the first leg of the third qualifying round, which will be played on August 3 or 4. The return leg will take place on August 10.
Celtic will face Czech team Jablonec in this competition if they can’t get past Midtjylland.
How to follow the game
Keep up to date with all the action at Celtic Park via our minute-by-minute live match blog, with our coverage starting at 6:30 p.m. on the Sky Sports app and website.