Peacock was impressive in his short stint in the big leagues, allowing one run in 12 innings. He held opponents to a .167 batting average.
"He has done everything I've asked of him," Johnson said. "He impressed everybody, not only in our organization, but in baseball. As far as I'm concerned, his year is done. I don't see myself using him out of the bullpen like he did in his first outing. I'll be tempted to, but it's not in the cards."