Berti Vogts has blamed Christian Dailly and David Weir for the goals Scotland conceded in their 2-2 draw with the Faroe Islands and warned the team's older players their days were numbered.
Scotland came back from two goals down to draw their opening European championship qualifier in Toftir on Saturday.
They have failed to win in six games under the former Germany coach.
"We have a group of 28 players who have sufficient quality for the national team, no more than that. We must carry on with these people," Vogts told the German sports agency SID.
"The older players, like Christian Dailly and David Weir, who both play in England, have already disappointed me. They were to blame for the first two goals, it wasn't the youngsters".
Vogts said there was no other solution but to continue with his reconstruction of the national team and he warned the media that their negative attitude was not helping.
"I can't understand why, even three or four days before an international, only negative things are reported," he said. "It's no wonder that players don't want to play for the national team but would prefer to stay at home with their families."