With Chelsea owner Roman Abramovich circling, Aguero turned out for Atletico to end the Premiership giants' pursuit of his signature - for this summer at least.
"I've always said I wanted to stay at Atletico and this is what has happened," said Aguero at the final whistle. "I am very happy for the goal, but especially for the triumph.
"We gave a good performance and everything went well. The goal came from a dribble when I saw a hole open in their defence. I was happy with the finish."