Kepa is a target for Real Madrid as his contract with Athletic winds down.
However, Juve are also interested as they prepare for the retirement of Gigi Buffon at the end of the season.
While Wojciech Szczesny is being groomed to succeed Buffon, Juve know the Pole needs competition and have identified Kepa as a potential target.
For his part, the young shot-stopper is remaining calm after making his Spain debut: "I'm happy and I'm enjoying this moment, I'm an Athletic and a National player, and I cannot to say a lot more, I just made my debut, I'm happy and that's enough.
"The truth is that the rumours do not make me nervous. I listen, I hear. I'm not blind I know what's going on around me but I know who I am. I have to stay calm."