Scotland captain Andrew Robertson says they must be sharper in front of goal after defeat to the Czech Republic in their opening Euros clash.
Robertson created five chances from left-back at Hampden Park, more than any other player, but the Scots were unable to convert and ultimately came undone courtesy of a Patrick Schick brace.
"It's hard to put your finger on it just now. The whole country wanted to get off to a good start. We were confident and excited going into the game. I think it comes down to not taking our chances," Robertson said.
"When you look back at the game, you can't say we've not created. We've had some really, really good chances that on another day we should have done better with. If you do better on that, then it's a different game. For our first game in a really long time, it's a tough lesson for us.
"At the highest level, and the best tournaments in the world, you have to take your chances when they came to us. The Czech Republic did that. We didn't, and unfortunately that's why we're on the wrong end of the result.
"For the first one, and the height of us, we really shouldn't concede from second balls or set pieces. We were really good at clearing the set piece, but you've still then got to pick up your man and defend it. To be fair to the boy, it is a good header. We've just got to be a wee bit stronger and better with our line.
"We started the second half really well, hit the bar, couple of really good chances, and I think it (second goal) was off one of our shots. Marshy has to be in that position, any balls in behind and Marshy's in a good position.
"It's a one in a million shot unfortunately. We can't lie, it knocked the stuffing out of us at that point. After that, we still created a couple of chances, if you put it down then it's 2-1 and the crowd start to lift and it's a different game. We just didn't manage it."