Jerzy Engel faces a tough task if he is to keep Poland's World Cup campaign on track and boost squad morale before their next outing against Portugal on 10 June.
Poland have been heavily criticised since their 2-0 defeat by South Korea.
And Engel has not escaped, with midfielder Marek Kozminski turning on the coach.
"If we want to win we have to change our tactics," Kozminski said after being played out of position on the right flank.
Asked what changes needed to be made, he said: "You'll have
to ask the trainer."
Engel has faced a difficult build-up to the World Cup and a near squad revolt after leaving out key players from both qualifying matches and the squad he took to the Far East.
However, he remains optimistic that Poland will be able to refind the form that saw them qualify with ease.
"We came to Korea to be first in the group, but now we only have chances to be second - and even this will not be easy," he said, reflecting on the defeat.
Following the USA's surprise win over Portugal, that challenge is now even greater and only a win over Luis Figo et al will see Poland qualify for the second round.
"I still believe we will progress," Engel continued.
"I really believe that we can defeat Portugal even though they are ranked higher than us.
"We can only play better and the players will not be so tense as before the game against Korea."
Engel was given support by former Poland goalkeeper Jan
Tomaszewski who rounded on the team for their lacklustre performance.
Tomaszewski, best remembered for denying England in qualifying for the 1974 finals, said a poor pre-tournament build-up had turned Poland from runaway qualifying group winners into also-rans.
"We got what we deserved," he told Polish daily newspaper Gazeta Wyborcza.
"The form we showed was the result of eight months of anti-training.
"If the Poles had played against Korea the way we did in qualifying, I wouldn't mind.
"Then we had a team and now we don't, because it has taken itself apart.
"The team destroyed itself after qualifying for the finals. They started to think of themselves as world champions."