There was talk of Crouch retiring from international football after his axing for the Switzerland game.
Redknapp told Sky Sports News: "It's been great for him playing for his country.
"He's had a great run of it, the last few years.
"So I don't see any reason he should want to pack up. I'd encourage him to keep playing and keep wanting to play for England.
"And all those lads, I don't see how they would want to give up their international careers."
Redknapp added: "It's such an honour to play for your country, you'd think they'd want to play forever.
"But if he asked my advice I would certainly tell him to keep playing, and if he's picked, play."