Luis Enrique's side lost 3-2 to Bayern Munich but progressed thanks to their 3-0 first-leg win at Camp Nou last week, in which the Argentine scored twice.
The 27-year-old has won the competition three times in his career but is determined to add a fourth medal to his collection.
"We're happy as we wanted to reach the Champions League final," he wrote on his Facebook page.
"But our objective is still the same: to win it."
