MICHAEL Appleton said Dan Crowley must learn to be more professional after leaving the teenager out of Oxford United’s squad.

The Arsenal loanee has scored three goals in 11 appearances this season, but missed Saturday’s 4-1 victory at home to Coventry City.

It was a decision made by Appleton, United’s head coach, who did not say whether the 19-year-old would be considered for selection when they host Gillingham tomorrow night.

He said: “I didn’t think his head was in the right place, so he was left out of the squad.

“There are a couple of issues I want to make sure are addressed in terms of what he does on and off the field.

“He’s a 19-year-old lad who has fantastic ability, but his professionalism at times lets him down.

“He’s had a few issues at Arsenal and Barnsley previously. It’s all a massive learning curve for him.

“Ultimately sometimes when people step out of line you have to put them in their place.”