Loftus-Cheek is this season on-loan with Crystal Palace, which has helped him make his England debut this past week.
Newton told Chelsea TV: “Everyone has to be patient with Ruben. I have no doubt he will get there because he is super talented.
“In some of his performances this season we have seen glimpses of his power, his technique under pressure and you just think, 'wow, in the right circumstances this guy can blow people away'. I'm excited about his future.
“The big thing for Ruben is consistency of performance and to stay fit. You have to remember he hasn't played regularly for three seasons, that's a big hit on a player."
Newton added: "I have been very impressed. We have sat down and spoken seriously about what he must bring to the table. He knows what he has to do and is applying it.
“Unfortunately the team make-up at Crystal Palace hasn't been great for him.
"With this being his first loan away from Chelsea, you'd want him to be in a more stable environment but they lost their manager, Frank de Boer, early in the season and it has been difficult for him."