Clarke's squad trained for the final time ahead of the Hampden showdown against the Czech Republic before returning to Glasgow from their base near Darlington.
And the 57-year-old has admitted that, after much agonising, he has now decided which 11 players will start the national team’s first match at a major finals in 23 years.
"As you would expect, it's a difficult selection process - 26 players all doing their best in training, a really high level of training," Clarke said.
"A lot of them have done really well for me before in international games. Difficult decisions, but I am paid to make them."
Clarke has faced a number of selection dilemmas from goalkeeper through to which players will lead the attack, now all eyes will now be on the Scotland team sheet when it is released around lunchtime on Monday ahead of the 2pm kick-off.