Valencia have expressed interest in Denis, though other offers are now arriving.
"I'm going to leave Barça and Celta is an option. I'm convinced that I'll play for Celta one day but I don't know when," he said during the presentation of his summer school.
"I've got offers from abroad but my priority is to stay in LaLiga.
"Playing in Europe is a priority too, but there are other options on the table."