Portuguese football website Ojogo reports that Cardiff are set to fight it out with La Liga side Elche for the highly-rated striker.
Vieira scored eight goals in 13 starts on loan at his hometown club Gil Vicente earlier this year.
Reports claim Braga are ready to let Vieira on loan or on a permanent deal.
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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.