Alex has been with Shakhtar since 2010.
"I want to respect my four-year contract with Shakhtar," he told Lancenet. "Then, once I've done that, I have a dream of playing for Juventus or in the Spanish League.
"I will try my best to make that happen over the next few years.
"I think my best performance in the Champions League this season was against Juventus in Turin. And even though they beat us at home, we are still going into the next round with a lot of confidence."