Vietto, who failed to score in 10 games this season for Atletico, had found himself relegated down the pecking order there after Diego Costa's return to the club from Chelsea.
Atleti is nearly surely through to the quarterfinals of the Copa del Rey, with a home return leg against Lleida coming in seven days' time.
Despite the knee worry, Brazil-born Spain worldwide Costa was enthusiastic about his return to the club he first joined in 2007.
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Costa's goal comes 99 days after Blues agreed to sell the sulking striker back to his former club for in a £67million deal, with Atletico shelling out £60m up front.
France forward Antoine Griezmann completed the scoring in stoppage time following the late dismissal of Lleida defender Marc Trilles.
Costa and fellow winter reinforcement Victor "Vitolo" Machin weren't allowed to play for Atletico until 2018 when the club's one-year ban on fielding new players expired.
"We must remain relaxed, as extremes are bad", he said.
Back in plenty of time for this summer's World Cup as well! "The team did well in a tough game, which is what makes me happiest".