In the first half, without the ball, Senegal formed two banks of four, leaving N'baye Niang and Mame Diouf upfront.
Senegal, back in the tournament for the first time since 2002, went ahead in the 37th minute when Thiago Cionek's attempted block of Idrissa Gueye's shot wrong-footed goalkeeper Wojciech Szczesny, who was picked to start over fellow Arsenal castoff Lukasz Fabianski.
Senegal defeated Poland in their opening Group H game with a 2-1 victory at the Spartak Stadium.
Poland striker Arkadiusz Milik is expected to be fit for the match against Senegal, despite suffering a hand injury.
Krychowiak would get one back with a header in the 86th minute but, as Nawalka would admit after the game, it was not almost enough on a bad day at the office for the European side. After going 2-0 up, Senegal switched to a back five and forced Poland backwards anytime they had the ball by closing them down quickly especially when they approached Senegal's defensive third.
This is Senegal's second appearance at the World Cup and it's the second time the team has come away with a monumental win. Poland must get more out of their main man against Colombia on Sunday.
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When is FIFA World Cup 2018 Poland vs Senegal match?
In a tightly-fought contest, Thiago Cionek's unfortunate own goal (37) handed Senegal the lead before their advantage was doubled through M'Baye Niang (60), who capitalised on a poor backpass from Grzegorz Krychowiak to score his first worldwide goal.
This will be the first ever encounter between Poland and Senegal.
Krychowiak sent a long ball back from deep inside the Senegal half, Szczesny rushed out of his area to collect the pass but Niang stole in to score to Polish disbelief.
"Yes, a number of African teams have lost their opening matches, but this doesn't mean there is more pressure on us", Kouyate remarked.
Poland were widely expected to qualify for the knockout rounds but after suffering a seventh loss in their last nine World Cup matches, FIFA's eighth-ranked team are in danger of making an early exit. Poland is ranked eighth, and six of the top eight teams in the Federation Internationale de Football Association rankings have failed to win their openers - Belgium and France are the exceptions.