Scotland captain Andrew Robertson says defeat to Republic of Ireland was a new low.
The Liverpool left-back admits the performance was nowhere near good enough for a dark blue shirt.
The boos from the Tartan Army were loud and clear at the end of a sorry 3-0 defeat to the Irish at the Aviva Stadium in the second round of Nations League group games.
Robertson said: "To the fans behind the goal booing us off, it was completely correct.
"We know they travel a long way and pay a lot of money.
"That performance is nowhere near good enough in a Scotland jersey.
"We will need to assess things as a team, assess individually and hit the reset button.
"Everything was good last year but this year the performances haven't been quite up to scratch as of yet.
When asked to assess the performance, the captain explained: "Nowhere near good enough. We've now said that twice in the space of ten days, which isn't us.
"We've let the manager down which is so disappointing for us. He set us up in a way and we didn't carry that out.
"I think every single one of us lost our individual battles which can't happen in these types of games.
"Second balls went to them and they were winning the tackles and when it goes like that then the result is only going to go one way."
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