Oh dear... Brazil sacked their coach Alexandre Gallo on 10th May, days after he announced his squad for the tournament
Shame for the tournament when Brazil are in so much chaos.
Gallo was also Brazil's u-23 Olympic coach but was deeply unpopular with many fans and football officials.
The squad list had already been sent to FIFA so there were no changes to it despite the coaching staff being gone.
http://www.worldsoccer.com/features/under-20-world...
"Brazil, traditionally one of the favourites ahead of the Under-20 World Cup, will go into the 2015 tournament in New Zealand without coach Alexandre Gallo, who was sacked following a poor fourth place at the South American Under-20 Championship in Uruguay. He had also been due to take charge of next year’s Olympic team and that responsibility will now fall to Brazil’s senior coach, Dunga.
Gallo had made drastic changes to the squad that will now travel to New Zealand under his replacement Rogerio Micale. His list of 26 players included just nine of the players who went to Uruguay in January.
There was no place for Atletico Paranaense’s Chelsea-bound midfielder Nathan, who did well at under-17 level but badly in Uruguay. Much more surprising was the absence of Fluminense’s Gerson, a left-footed midfielder of undoubted pedigree. His exclusion may have been the final straw for new federation boss Marco Polo Del Nero, and the news of Gallo’s sacking was announced at a strange time – late on Friday night, where it was “buried” by the start of the Brazilian championship."
Sán @Zizouology May 9
"Brazil FA sack U20 coach Gallo after the same man announced the squad for the upcoming U20 World Cup. Sounds very weird."
Big Pete 65, Christchurch
COYN 
