Boca Juniors coach Carlos Ischia is sweating over the fitness of playmaker Juan Román Riquelme ahead of the second leg of its Copa Libertadores semifinal with Fluminense on Wednesday.

Riquelme scored both goals as Boca drew 2-2 with its Brazilian opponents in the first leg in Buenos Aires last week, but is doubtful for Wednesday's game as he is suffering from a bout of gastroenterocolitis.

The 29-year-old has a fever and is vomiting frequently, although club officials are hopeful that he will be able to play some part in the match, even if he is not fit enough to compete for the entire 90 minutes.

If Riquelme does miss out, Leandro Gracián and Fabián Vargas are the two players most likely to be vying for his place in the starting XI.

Goalkeeper Mauricio Caranta looks set to miss out through injury once more, meaning that Pablo Migliore will keep his place between the sticks despite the error that gifted Fluminense its second equalizer in the first leg.

Experienced midfielder Sebastián Battaglia indicated to the club's official Web site that the team are all in the support of Migliore and that such mistakes are exemplified because he is the last line of defense.

"When a goalkeeper makes a mistake it usually causes a goal. No one wants to make mistakes, but we're all human beings and mistakes happen," he affirmed.

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