"After the match, everything should be completely clear," said Guimaraes, a Brazilian-born and naturalised Costa Rican.
Guimaraes played under China coach Bora Milutinovic during Costa Rica's World Cup run in 1990 when the Ticos reached their only finals.
And he is expecting the veteran coach to be well prepared for the Group C clash.
"He'll probably even use mathematical equations in this World Cup," Guimaraes said.
Striker Paulo Wanchope, who had surgery on his right knee seven months ago and is still receiving therapy, missed training on Wednesday.