The 22-year-old had been linked with a move away from the Spanish champions in the summer after struggling for first-team football last season.
"I'm not going to go into the matter of my contract renewal. The most important thing for me right now is to play well, ensure that I keep up the level I've been playing at, so that this earns me my renewal and for many other things in the future," he told reporters at a press conference.
"At no time have I considered leaving Barca. My renewal is on the right track."
Bartra came through the youth ranks at the Catalan outfit.