After an 0-for-4 showing in Tuesday's 3-2 win, Dunn has only two hits in his last 33 at-bats, spanning nine games. The 32-year-old struck out in 20 of those at-bats, including all four of his at-bats in Monday's 4-1 loss to the Twins. He has struck out in seven of last 10 at-bats.
The source of the funk may lie in Dunn's approach, Ventura said before Tuesday's game.
"Right now, just pulling too many pitches," Ventura said. "Early in the year he was hitting a lot of balls to center field. You can get into that thing where you try to hit home runs every time you go up instead of just play and hit."
Dunn is hitting .208 with 23 home runs -- third most in the American League. He is a year removed from hitting a career-low .159 with 11 homers.
"I don't think it's anything like last year," Ventura said. "It's just one of those you just have to work through. I'm not worried about him falling back into what he had last year. It's just a little funk like everybody else goes through during the course of the year."