Clarke is the 4th player to sign for Stoke from Portsmouth this season.
Our Portsmouth pundit, Keith Allman wasn't sure of the youngster's ability to play in the championship just yet.
He said: "It's really hard to say if he's much good or not. He's never played in the first team for us and although he doesn't look out of his depth for the reserves, I still couldn't genuinely say if he was a good or bad player.
"I'm more surprised he's gone straight to the Championship rather than starting his first team career somewhere in League 2, but I guess it's a case of "sink or swim" and that depends on whether or not he ever stands a chance here".