Villa management delighted with young wingers Grealish, Robinson
The pair were outstanding for victory over Blackburn Rovers.
Cowans told Villa's website: "Callum is a very talented player who can cause anyone problems.
"He has been on fire in training and Jack Grealish has been excellent too.
"Jack's balance is fantastic. He is two-footed and when he gets at people he can go past them so comfortably."