The 16-year-old will play the Wimbledon champion in the Davis Cup World Group playoff rubber between Croatia and Great Britain.
"I don't think I can win - only if he injures himself," BBC Sport quotes Coric as saying. "I haven't played a five-set match, so if I'm playing it's going to be tough."
Coric went on to express his pride at representing Croatia in the competition.
"It's unbelievable to play for my country," he added. "When I was eight or nine we won the Davis Cup - I was watching on the TV and hoping one day I'm going to play there."