Pique is tied to Barca until 2022.
He told Mundo Deportivo: "My last team will be Barça, I have no intention of wearing another shirt.
"If I see that I lose importance or see that I am not at the right level, I'll have no problem leaving before then.
"I think it will not happen because I know myself and I am capable of enduring until 2022, but you never know."
Pique also sought to clarify comments last week where he suggested he was only getting "4-5 hours sleep a night" due to his business interests.
He said, "What I said is that one day I sleep four or five hours, but that in general, and especially on game days, I sleep 10 hours at night and two hours of nap.
"Yes, it is true that there are some days I sleep less, but not only for organizing this (Davis Cup), but because I like the NBA and the games are late, and I am convinced that there are many people who are the same.
"There are a lot of things that are what give you the performance. Sleep, food, is very important, but there are other things like training well, being mentalised before the games ... there are many things and in the end I try to fulfill them all. If I have been at Barça for 12 years and 16 since I debuted, it is not by chance but because I have routines that I try to accomplish and that have worked for me."