Kyle Shanahan thought he knew what he was getting into.

The49ers coachhas been around football his entire life. He played it in college. And as a teenager, he watched his dad hoist a Lombardi Trophy twice.

But after signing up to manage a team in theFanatics Flag Football Classic, he quickly learned he didn’t know a lick about the flag iteration of his favorite sport.

“Once we saw a couple games,” the 46-year-old said Friday, “I realized I didn’t know what I was getting into. And I had to figure this out really fast.”

Many who tune intoSaturday’s showcaseat BMO Stadium will almost certainly have a similar experience to San Francisco’s sideline manager.

The field is only 50 yards long and 25 yards wide. The action is 5-on-5, not 11-on-11. And no tackling is allowed.

“We can’t take a play from our game and run it in this game,” Shanahan said. “It’s totally different.”

The event will pit three teams against one another in a round-robin tournament. Two of the rosters — dubbed Wildcats FCC and Founders FCC —will comprise current and former NFL players. The third squad in the mix is the U.S. men’s national team.

Each game will feature two 15-minute halves with a running clock.

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