Strachan has improved the Scotland team out of sight since he took the reins at the beginning of the year and former Rangers, Wolves and striker Miller, who retired from the international scene recently, is thrilled with how things are now running.
"The manager's done great. He came in obviously 10 or 11 months ago and he has really got the squad back together and working hard," he told Sky Sports News.
"Not just that, we have got some fantastic players but some of the performances and results over the past few months have been really great.
"Obviously I was working in a few squads with Gordon and there's nothing complicated about it. He's come in and told the players what he wants them to do and how he wants them to perform and the players have responded to that.
"They have put on performances that we never produced at the start of the campaign but we have finished off great with some fantastic results, namely the two games against Croatia. To beat Croatia home and away is a fantastic achievement.
"Even in the last two internationals, we never played great against the USA or Norway but we never got beat. Any international away from home is a tough fixture these days. To beat Norway away from home, not playing your best, but just grinding out a result is another fine achievement."
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