Many inside Barca believe Zubi was made a scapegoat by Bartomeu when he was sacked four years ago.
The former goalkeeper told Efe: "Those players of mine who justified that I could be fired that night of the Copa del Rey, six months later won the League, the Copa and the Champions League (in 2015).
"But I think that is not the important thing, the important thing is the work done that is seen on the field."
Zubi signed Marc-Andre ter Stegen for Barca, who is now their outright No1.
He added: "Ter Stegen has made himself, it is true that we saw him and chose him, but the merit of Ter Stegen goes to who he is, the coach of the goalkeepers and the main coach who supports him."