Lee picked up multiple hits in each of his past four games and boosted his batting average from .263 to .305 in a matter of five days. He also hit a towering home run in Wednesday night's victory against the Brewers.
"Anytime you got the guy in the middle of your lineup, and he's hot and people are worried about him hitting the ball and especially smoking home runs like he did last night, it makes everybody around him better," Mills said.
Lee, not known for his baserunning abilities, was also able to score from first base Wednesday on a Jed Lowrie double that caromed off the outfield wall. Mills said Lee has been working on his sprints.
"We're going to have to end up getting an oxygen tank in the dugout for him when he comes in," Mills said.