<text>  Real Madrid youngster Jack Harper has been snubbed by Scotland Under-19s manager Ricky Sbragia because he is a luxury player who isnt big enough. The young Scots travel to play three games against Austria, Italy and Croatia in the UEFA Under-19s Championship. Highly-rated forward Harper who has netted three goals for Real Madrid in this seasons UEFA Youth League, is midway through a five-year deal at the Bernabeu, and can count former club legend Zinedine Zidane as one of his coaches. Real Madrid youngster Jack Harper in action against Ludogorets in the UEFA Youth League match . Scotland Under-19s manager Ricky Sbragia has left Harper out of his squad for the upcoming games . Among Harpers coaches at Real Madrid are former France international Zinedine Zidane centre Hes already been linked with a move to both Liverpool and Manchester United, but that hasnt been enough to earn him a spot in the squad, despite playing in the qualifiers in Lithuania. However, former Sunderland boss Sbragia has explained its nothing personal with the 19-year-old, hes just gone for a more physical approach, despite Harper standing at over 6ft tall. Sbragia explained: Our concentration is on the opening game with Austria and weve deliberately got more height in our squad. Thats one of the reasons why Jack isnt in. Unfortunately, I dont see enough of him in action. The last time he was with us, he did OK, but I wanted a little more impact. At Real Madrid he can float all over the place, which he does. But with us, he has to be more disciplined. Hes an exceptionally gifted lad, but sometimes we cant carry him. He can be a luxury sometimes. In some cases, if its going well, he can be a good luxury. Highly rated forward Harper has already been linked with moves to Manchester United and Liverpool . But the ex-Manchester United reserve team coach still believes Harper has a big future ahead of him. Sbragia stressed: Listen, Jacks time will come. The last time I spoke to him, he wanted to really settle in at Real Madrid and find a place there. Thats been a big thing for him. Ive gone with the boys Ive seen most in the last six months. We keep tabs on Jack and see video clips of him. We have people over there who keep their eye on him. There are others Ive left out like Dominic Thomas at Motherwell who will have gripes that theyre not in the squad. But Ive picked a group of 18 which will hopefully do well for us. Its my opinion and Im not saying its right. But the squad Ive picked is an extremely strong one. I can only pick 18 when I really could have picked 26 or 27. Ive gone for a physical side and runners. Hopefully Im right. Its purely tactical and there certainly hasnt been a lack of enthusiasm from Jack about playing for Scotland. Harper is currently midway through a five-year deal with Real Madrid and is tipped to have a big future . 