His side are 500-1 outsiders for the competition, and have only recorded one victory in their history of appearances at the competition.
But their second win will not come easily in a group containing Japan and Belgium as well as the Russians.
However, Souayah said the Carthage Eagles would be trying their hardest to achieve it.
"Tunisia is a small nation with only 10m inhabitants but
we will do our best and give maximum effort for our country," he
Midfielder Zoubeir Baya said a draw against the
Russians would be a positive result.
"The first match is often the most difficult but we must be
confident," he said.
"To take a point from our first match would be good for us."
Souayah confirmed that he had been watching Russia and adapted his tactics accordingly.
"I don't think they will play long balls," he said.
expecting them to play a short passing game and to play down the
wings as much as possible."