Del Bosque has been linked with Real as a candidate to succeed coach Fabio Capello.
He said: “To sell Ronaldo and leave Beckham out of the team was the wrong thing to do halfway through the season and has caused a crisis from within. This has harmed the team more than benefited it.
“The situation is delicate, not only because of the lower standard of players that are there, but also by the image that Madrid always has had when dismissing its stars.
“The instability at board level has also hurt, because even though the team is alive in the Liga and Champions League, people are unhappy with what is going on at the club.”