The 19-year-old Chelsea youth has joined the Millers on a season-long loan deal which has given Stubbs a feeling of excitement.
"He's quick and he'll give defenders problems," he told www.themillers.co.uk of the 19-year-old who impressed on loan for Vitesse Arnhem in Holland last term.
"Whenever you have real pace it's always a problem for defenders and its something they're scared of and we're hoping that when he comes here he will be one that puts opposition defenders on the back foot.
"Predominantly he is a wide player, he has played off the striker or in that position on a few occasions but he is more of a wide man.
"He's very direct and very positive when he gets in one-versus-one positions and we know he's scored goals."