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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As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?
Being an amiable guy is good for you and Jurgen Klopp is living proof.