The European champions have not scored in any competition since a 1-0 LaLiga victory over Espanyol on September 22 and are without a win in their last four games.
Karim Benzema hit five in four games at the start of the season but is now without a goal in his last seven appearances, while Gareth Bale has gone four league games without scoring and Mariano Diaz has only netted once since his return from Lyon.
“I wouldn’t sign anyone in the winter market because if what you want is to bring in a star or someone who improves what you have, I think that if a club allows a player to leave like that it’ll be because he’s not right,” he told Marca.
“Arriving in January without having good rhythm is very difficult. They won’t easily let a striker leave if he has 20 goals with his team.
“Sometimes, a leader is missing. Madrid didn’t have one in Moscow [a 1-0 Champions League defeat to CSKA] and it was too noticeable.”
Madrid’s form has seen pressure mount on head coach Julen Lopetegui, with some reports suggesting he will be sacked if they lose the Clasico to Barcelona on October 28.
“The players barely care. It’s the coach who is thinking about the next game all day,” said Schuster, now coach of Dalian Yifang in the Chinese Super League.