"This isn't basketball; you can't go play a pickup game of football," Foster said Friday, via The Associated Press.
Foster said it's impossible for players to give 100 percent in this format.
"I think it's an honor and a tradition, but for you to expect the best athletes in the NFL to come out and play a game 100 percent when you can't game plan, you can't blitz, you can't do all these things, it's not going to be competitive like everybody wants it to be," Foster said.
"Don't tell me there's not great value in that conversation," Manning said. "If they cancel this, then I think the NFL will lose that. Is there monetary value in that conversation? I would argue yes. I would argue that's helping keep the NFL as great as it is. So I'd hate for it to be canceled."