Denmark Soccer's Christian Eriksen

Danish soccer star Christian Eriksen is getting a "heart starter" implanted to his chest soon ... a big step toward ensuring he never suffers another terrifying cardiac episode again.

Denmark national team doctor Morten Boesen made the announcement Thursday ... saying after multiple exams on the athlete, specialists have determined the 29-year-old needs an implantable cardioverter-defibrillator.

"This device is necessary after a cardiac attack due to rhythm disturbances," Boesen said.

"Christian has accepted the solution and the plan has moreover been confirmed by specialists nationally and internationally who all recommend the same treatment."

As we previously reported, Eriksen went into…