Davies feared career was over due to COVID-19 complications
"That was very scary, especially (because) the doctors are saying that they don't know how long I was supposed to be out," Davies told ESPN. "I think that was the most scariest part.
"At that time, I had doubts in my head whether I'm still going to be able to play football, but everything worked out at the end. I'm happy, and I'm grateful for the doctor taking such good care of me."
He added: "I'm happy that I can be back on the pitch."
The 21-year-old was sidelined for almost four months after testing positive for COVID-19 during the Bundesliga winter break last season. Following his initial diagnosis in January, Bayern Munich announced that Davies was ruled out indefinitely due to myocarditis. The heart condition was detected during tests to determine his availability.
The ailment forced Davies to miss important matches for club and country, including Canada's victory over Jamaica in March to seal a spot at the 2022 World Cup in Qatar.
Davies was medically cleared to return to action in April for the final weeks of the Bundesliga season. Bayern went on to be crowned champions for the 10th campaign in a row.