( CNN ) -- Mexican crooner Vicente Fernandez , an icon of folk music known for his ranchera ballads , will undergo a liver biopsy in Houston on Tuesday , he announced . Considered Mexico 's most famous living singer , Fernandez told CNN affiliate Foro TV that doctors had found a 2-centimeter `` ball '' in his liver that requires examination . `` They do n't know what it is , but it should n't be there , '' Fernandez said . Fans will anxiously await the results of the biopsy . Fernandez asked the public not to be alarmed and to pray for him . `` To clarify things , in reality I do n't have anything , unless they tell me something '' after the test , he said . Near Mexico City 's Plaza Garibaldi , where mariachi groups often perform Fernadez 's songs , fan Isidro Salazar said he was praying for the singer . `` I hope that God gives him relief , '' Salazar said . Many in Mexico count Fernadez 's songs among their personal repertoire and can sing lines from his well known ballads on cue . Fernandez 's career has spanned four decades , and he is known as the king of ranchera music . He has appeared in more than 25 films as well , though his music career has eclipsed his acting career . `` For more than 45 years , Vicente Fernandez has maintained his position as the biggest living singer in Mexico , combining a operatic vocal range with a deep comprehension of the folk roots of ranchera music , '' his official biography says . The 72-year-old has won a bevy of awards , including , this month , three Mexican Music Billboard awards . He has a star on the Hollywood Walk of Fame . CNN en EspaÃ±ol 's Krupskaia Alis contributed to this report .
Vicente Fernandez is considered Mexico 's most famous living singer . Comment: He will undergo a biopsy in Houston on Tuesday .