Gordon Strachan has hit back at critics of his rotation policy and told his disgruntled players they have no right to complain.
Strachan has made full use of his squad so far this season with Celtic competing in the UEFA Champions League as well as on the domestic front.
Some have argued that Strachan needs to settle on a regular line-up but the Hoops boss believes his players only have themselves to blame if they are being left out.
He said in the Evening Times: "People have to remember, I watch training every day, and I notice players who are working well.
"I hear some saying, 'I'm not getting a chance'. Well, you do get a chance. I see you every day. I see your fitness. I see your commitment, I see your mental strength, I see your drive.
"I have never missed training since I came here. I make sure I see every session. And I can sniff out if players are at it or not."
Massimo Donati made his first appearance of the season on Tuesday as Celtic beat Livingston in the Co-op Insurance Cup.
The Italian midfielder was withdrawn just past the hour mark and Strachan has refused to guarantee him another game any time soon.
"The likes of Tuesday will never be considered make-or-break nights for anyone," said Strachan.
"Massimo's best stuff was done attacking wise. He was driving forward and getting into good positions.
"He just needs to tidy up one or two little things in the middle of the park.
"That comes with games. But is he going to get games? I don't know."