Ally McCoist insists everyone should respect Kris Boyd's decision to quit Scotland and stop criticising the Rangers striker.
The 25-year-old informed boss George Burley he no longer wished to be considered for selection for the national team during his tenure.
Boyd had become increasingly frustrated by his lack of involvement during Burley's stewardship and quit last week after spending 90 minutes on the bench against Norway.
"I can totally understand his frustration,'' said Rangers assistant manager McCoist. "Kris has been criticised by a lot of people but it's his decision and we should respect it.''
Burley accused Boyd of a lack of passion and commitment to the Scotland cause and suggested a poor workrate in training resulted in his omission for last Saturday's World Cup qualifier.
But McCoist added: "Kris has been fantastic in terms of his attitude. I haven't seen Kris as committed to Rangers as I have in the last few months.
"I just detect a bit of resilience. Kris doesn't need to prove anything in terms of his goalscoring but I see someone who wants to prove something to himself.
"He's in as good nick as I've ever seen him and training hard. We're looking at his fitness - not just his running but how he does in games and gym work. The results are good.''