The Australian star has managed just two matches since February and Moyes admits he will have to remain cautious with the Toffees' leading scorer for the final four matches of the season.
"Tim looks as if he probably got about 60 minutes in him for most of the games," Moyes told the club's official website.
"We are not sure how his foot is going to react so it's a case of how we try and play it with him and how we use him between now and the end of the season."
Apart from treating him with kid gloves for the rest of the campaign, Moyes plans to give Cahill a very lowkey summer so he can get back to full fitness.
"(The break is important) only if it gets rid of his foot injury. If it lingers then the break is no good," he added.
"It is concerning because it is one of these things that could go away tomorrow or could be here in three months times."
As for surgery for the 31-year old attacking midfielder:"I don't think so," Moyes said. "I think it is something that tends to burn itself out and go away in time."