Michael Halas from the Bishop Grandin Ghosts gets help off the field after hurting his ankle during a game. (Kyoshi Maguire/CBC)

Despite strict school policies, not all injuries suffered by Calgary's thousands of high school football players are being reported.

About 25 injuries, ranging from minor bruises to concussions, were reported in the Calgary Catholic School District last season, said spokeswoman Janet Sutherland.

But David Diluzio, coach of the Notre Dame Pride, said his players alone suffered about 10 injuries last season, leading him to question the reporting process.

"The ones that aren't very serious or deemed very serious, I don't think those are … being reported," he told CBC News.

Schools in both the Catholic and public school districts require that all football injuries, even if they're considered minor, be reported to the Calgary Senior High School Athletic Association through a written form.

The issue of documenting high school football injuries was raised during a fatality inquiry into the death of Tyler Zeer, who died after a helmet-to-helmet collision with his teammate at a Bowness High School practice in 2004.

The Bishop McNally/Father Lacombe Laser Wolves and the Central Memorial Rams play their first game of the season. (Kyoshi Maguire/CBC)

At the time, Judge Catherine Skene found the collision caused a concussion that led to Zeer's death, but said previous injuries were not an obvious contributing factor in the case.

Tom Parker, executive director of the athletic association, said even though equipment has improved and coaches are better trained since Zeer's death, it's important for coaches to report all injuries.

"You put yourself in a very precarious position if you start making those evaluation calls," he said.

Last season, 107 injuries were reported in the Calgary Board of Education, where 1,400 students play football in the junior and senior ranks, said spokesman Ted Flitton.

None of them resulted in any insurance claims or lawsuits, he added.

Kirby Fabien, who now suits up for the University of Calgary Dinos, says players themselves sometimes chose to play through injuries when he attended Bishop McNally High School.

"We just got hurt but just had to play through it because we didn't have that many players usually and then we just had no trainers really, so it wasn't organized," he said.

With files from Bryan Labby