On 30 April 2014, Costa won and converted a penalty in the second leg of the Champions League semi-final against Chelsea, as Atlético won 3–1 at Stamford Bridge and advanced to the final of the competition for the first time since 1974. He finished the league season with 27 league goals to become the third highest scorer, and the team won the title for the first time since 1996, but he was substituted after 16 minutes of the last match of the season against Barcelona due to a hamstring injury. Atlético sought to cure this injury before the upcoming Champions League final against Real Madrid by sending him to Belgrade for treatment with a horse placenta, and he was included in the starting line-up for the decisive match. However, he left the pitch after eight minutes in an eventual 1–4 loss; manager Diego Simeone later admitted a personal mistake in selecting the player to start the final despite his recent injury. Costa scored eight goals during the Champions League campaign, equalling the record held by Vavá since 1959 for most in a season by an Atlético player, and in his entire career was in the top ten Atlético players by goal average. At the season's LFP Awards, he was nominated for the league's Best Forward, losing out to Cristiano Ronaldo.