"In Spain I had the experience in Valencia when in the first year we won La Liga after 31 years without winning the league, and against Real Madrid, Barcelona, Deportivo and Atletico Madrid," he said.
"And why? Because we were changing the team every game. In January we were eight points behind Real Madrid and we finished six or seven points ahead.
"Why? Because we were fresh at the end of the season, the last two or three months we were really, really fresh and we were playing at another level.
"We try to explain to our players why we decide to rotate. It's not possible to play 60-65 games 100% fit, it's impossible now with the tempo and the football.
"People talk about 20, 30, 50 years ago but it's different, now you can play with a really, really high tempo and after you finish the game you might need to fly to another country to play another really, really important game.
"Then you come back and a few days later play another important game against a tough team, with a lot of physical contact."
