Vieira returned to Porto on-loan this season and discussed his progress after their Champions League defeat at Lazio in midweek.
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The Portugal international said, "I feel better and better, it was a complicated phase for me, I have had some injuries.
"Now I'm coming back and gradually returning to my football, what I really am. And I'm one more to help this club.
"I will give my maximum and we will continue in the fight for qualification."