Ekblad was injured in the World Cup of Hockey 2016 during Team North America's first game on Sunday, against Team Finland.
Initial reports said Ekblad sustained a concussion, but Sportsnet reported Tuesday he has a neck injury.
"Not overly concerned about it," Panthers general manager Tom Rowe said Tuesday of Ekblad, who had two concussions in the past 25 months. "A little bad luck. I think he's still probably getting used to the [NHL] a little bit. He probably needs to be a little more aware in certain situations, but I don't think we're overly concerned about it.
"There's doctors [in Toronto], but we'd rather him come back here and see our docs."
Ekblad, 20, signed an eight-year contract extension reportedly worth $60 million (average annual value $7.5 million) that begins next season.
Ekblad was one of four Panthers who competed in the World Cup and missed the first practice (forwards Aleksander Barkov, Jussi Jokinen, Vincent Trocheck).