The game will mark the West Africans' return to the global gathering since making their debut in 2002.
“We’ve worked very hard for the last two to three weeks to prepare for the tournament," said, West Ham midfielder Kouyate.
"The last couple of weeks have been particularly intense, our coach has made us work very, very hard!
"The team is ready. We are fully prepared to play this game against Poland.
“We have to play as usual and we have to enjoy it.
"The team and myself are fully ready because this is a World Cup. We can’t fall asleep."
It has not been the best of tournaments for Africa in Russia thus far.
“Yes, a number of African teams have lost their opening matches, but this doesn’t mean there is more pressure on us," Kouyate remarked.
"This is the Senegalese team, we have done a lot of work in the last few weeks and today is going to be the most important game for us.
"It is going to be the first final.”
The Teranga Lions will face Japan in their second game on June 24 before wrapping up the group series against Colombia four days later.