Pastore dropped out of the competition earlier this week, claiming the intense training for the show was too physically demanding.
The show's producer, Conrad Green, tells People magazine, "Vincent just turned 60 and he had a heart condition last year.
"Once he started training he said, 'Wow. What have I got myself into?'"
Despite only having three weeks to rehearse for the show's March 19 premiere, Ratzenberger insists he will be ready to compete.
His representative adds, "He likes to cut a rug. People will be surprised."
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