Real Madrid attacker Alvaro Morata is impressing management during their tour of US.
Morata is expected to make coach Jose Mourinho's 25-man squad for the new season.
Real No2 Karanka said: "This last season his progress has been very good. He is a player who earning what he has with hard work and got him into the first team. He is here in very good circumstances and will certainly have his opportunities. He has very good potential. In the three weeks training with us he has been shown that he is ready to be playing with us."