Isco is out of tonight's Champions League clash, though Real insist it is due to injury.
Asked about the midfielder, Luque told AS: "Solari has made very complicated decisions with very important players, such as Isco. For me, he was the best Spanish player we had.
"With Zidane Zidane, he did not start playing either, but he rebelled working hard and won over both Zizou and the Bernabéu, but I think that with Solari he lacked that attitude a bit.
"In addition, Vinicius has appeared, and Lucas Vázquez is doing spectacular things. I see that the Isco problem has little solution.
"And in Madrid, what is not there is time."