Fletcher missed Saturday’s 1-0 win in Liechtenstein, which offered Craig Levein’s men renewed hope of qualifying for Euro 2012.
Scotland go into the game needing to at least match the result achieved by the Czech Republic in Lithuania to secure a play-off spot – and Fletcher is aware of the size of the task.
He said: “We are under no illusions, they are the best side we have faced by a long way.
“I watched them against the Czech Republic the other day and they had 65-70 per cent of the ball. So we have to go with a game plan.”
EURO 2012 | THE PERMUTATIONS
Already qualified: Germany, Italy, Holland, England and Spain will join the co-hosts Ukraine and Poland.
Nearly there: France need a point against closest rivals Bosnia in Paris, while a win for Sweden over Holland would see them qualify as best runners-up. Greece need a point from their last game to qualify ahead of Croatia. Portugal and Denmark meet in Copenhagen to decide who wins Group H.
Set for the play-offs: Turkey can pip Belgium for second place in Group A, while Serbia must win in Slovenia to finish above Estonia in Group C. Norway can still finish ahead of Portugal or Denmark as long as the Group H summit meeting doesn’t end in a draw.