Jose Mourinho has warned Carlo Ancelotti not to make the same mistake he did at Chelsea by overstaying his welcome.
Former Blues tactician Mourinho proved hugely successful and popular during his time at Stamford Bridge.
He helped the club win no less than six trophies during his three years at the helm, including back-to-back titles.
However, despite deciding to stay he left suddenly by 'mutual consent' after a number of bust-ups with owner Roman Abramovich.
Current incumbent Ancelotti's future is currently the subject of intense discussion and Mourinho believes he should go when he knows the time is right.
"When I did the six figures in the air at Wembley, to mark six trophies at Chelsea when we won the FA Cup in 2007, it could have been my last night at Chelsea," said Mourinho.
"I had the chance to go to Real then and said no. Probably I should've said yes at the time. I decided to stay and four months later had no job!"
Mourinho later took charge at Inter Milan after leaving Chelsea and he is now boss of Spanish giants Real Madrid, although he is keen to return to England one day.
"I'm probably missing you more than you are missing me," he added. "One day I will leave the Bernabeu and then I want to live in England again.
"This season I read the most intelligent quote. I can't say it's mine, but from Sir Alex Ferguson - the number one manager in the history of the Premier League - who said he doesn't want to retire.
"That's exactly what I want to say when I get to 60. I want to live my football life as long as I can."