The 29-year-old, who registered 19 goals in all competitions last season, is expected to lead the line when Valencia travel to Real Betis in La Liga this weekend.
"It would be great to score 20 goals this year. During the last two seasons I have managed 19 and I would like to beat that," Jonas told reporters at a press conference. "Twenty would be an important figure for me, but I hope to manage more."
Jonas has also scored twice in eight appearances for Brazil.