"I think he's good enough to play for the top four," Armfield told the Blackpool Gazette.
"I think he's proved that he can play in the top level."
"It's difficult to say how he'd do at somewhere like Man United, as he didn't pull up any trees at Rangers, but I think he's good enough.
"People keep saying he's a big fish in a small pond at Blackpool, but I don't agree with that.
"There are other good players at Blackpool, as well as Charlie, and he knows that."