Johnson homered in his first game, and in his first 11 games he hit .333 with five home runs and 17 RBIs.
It has been tough sledding for him since.
In the next 15 games, Johnson hit .103 with no homers.
"It's just part of the game," Johnson said. "I got a little bit out of my comfort zone. I'm new here, so I just have to figure out my way of fixing it here. It's just part of the whole learning process for me. I'll figure it out. I've been in slumps before, I'll be in slumps again."
Johnson was out of the lineup Thursday with a case of the flu.