The 69-year-old, who six days ago led Spain to their first major trophy in 44 years at Euro 2008, has signed a two-year contract in Istanbul.

"If you want to be successful, you have to take some risks," said Aragones. "I had to take this risk, and try something new.

"Of course, I will always miss Spain, but now I'm only focused on Fenerbahce's success."

Aragones was impressed last season with Fener's run to the Champions League quarter-finals, where they were eliminated by eventual runners-up Chelsea.

"I'm so happy to be a part of this great club," he said. "Fenerbahce had a great season in the Champions League, so now everyone knows what we are capable of achieving.

"I watched Fenerbahce in the Champions League, so I know my players very well. They all are very strong and qualified."

Aragones succeeds Brazilian Zico, who left the club last month after their second-placed Super Lig finish.