Eller joined Atletico from Turkey’s Trabzonspor.
He said: “I am very happy. I’m very grateful to Atletico for signing me, for showing faith in me. I arrive here with great enthusiasm and a desire to help the team.
“My new teammates have welcomed me with open arms. It’s a very young dressing room and I like that. The atmosphere is spectacular.
“My aim here is to help Atletico become champions. In the last team I played for (Internacional de Porto Alegre) we were champions and I want to do the same with Atletico.”
