Michael Ballack says the decision to release him from Chelsea was made by Roman Abramovich.
The 33-year-old, who will miss the World Cup due to the ankle injury he suffered in the FA Cup final victory over Portsmouth, will leave Chelsea when his contract expires at the end of this month.
Ballack has been at Stamford Bridge since 2006, but the London club were unwilling to offer the German the two-year contract he was reportedly seeking.
"Chelsea was always my first choice as I had four great years at the club and enjoyed every minute, but it was not to be. It's still my first choice, even now, but it was not up to me. The decision was down to Roman," Ballack said.
"It's unfortunate we couldn't come together, but I have to put it behind me. I've known for a while that the negotiations had stopped and it's time to move on. I have to find a new club and carry on with my career."
Ballack insisted his career at the highest level was far from over, and the former Bayern Munich player revealed he could return to his homeland.
"To end my career like this is not an option," Ballack added. "I want to play for at least two more years at the highest level so I can play for Germany at the European Championship.
"I've played in three Euros and two World Cups so know how special they are and can't end like this. I'm even more determined to carry on since I've been injured and the motivation is growing inside me every single day.
"I'm not yet ready to 'retire' by going to the United States or Dubai and want to stay in Europe. I'm a proud German who always enjoyed living there, so have some options back home."