Steven Naismith says it is hard for the Scotland players to accept their role as the “warm-up act” for other countries participating in the European Championships next month.
The Scots failed to qualify for Euro 2016 after finishing fourth in their qualifying group.
They now have end-of-season friendlies against Italy in Malta on Sunday and France in Metz on 4 June.
“It’s not great to be the warm-up act,” said Norwich striker Naismith, 29.
“Everybody’s just got to realise that this is the feeling and you don’t want to be doing it again when you’re that close in such a good position.”
Gordon Strachan’s men put themselves in contention to qualify for the finals with good results in the first half of their qualifying campaign.
But defeat in Georgia led to their downfall, and they eventually finished behind Germany, Poland and Republic of Ireland.
Naismith hopes lessons have been learned from that failure which will inspire the squad when their qualifying campaign for the 2018 World Cup begins in September.
‘You want to get to one tournament at least’
“It’s good to meet up and see the boys and get training and test yourselves against two world-class countries, but we are the preparation (for them) and that’s a massive disappointment,” he said. “That’s the worst part of it.
“Guys down south are talking about going to the Euros; they all have that buzz and a lot of my team-mates haven’t been to a tournament for a while, so they are experiencing what we hoped we would have been.
“When you are younger you maybe think, ‘hard luck, but we have got next year’ but for those of us perhaps looking at the last few campaigns we could be involved in, you do want to make a mark and get to one tournament at least.
“Everything was in our favour and it was a massive blow because it was such a good opportunity to qualify.
“But there is a real competition now from the younger players coming in. I have been surprised by the quality of them, especially those who haven’t been in squads before because they have maybe missed out on the Under-19s and 21s. It is going be exciting times.”