Brantley has filled in admirably as the Tribe's tablesetter, but the role was handed back to Sizemore when the center fielder was activated from the 15-day disabled list on Sunday. Sizemore had been sidelined since last June after undergoing microfracture surgery on his left knee.
Acta said Brantley knew about the change ahead of time and the outfielder took the news well.
"We spoke to Brantley," Acta said. "Brantley knew that for a while now. Grady's not going to play every day. It's impossible to ask him to play every single day coming back from this surgery right off the bat. When he's not playing, Michael is going to lead off again.
"Michael was great about it. Michael is the type of player that we want around here. He's unselfish. He just wants to do what's best for the team. He really doesn't care where he hits as long as he's contributing."
Brantley had a scheduled day off on Sunday, but he entered the day batting .302 with four doubles, six RBIs and a .367 on-base percentage. When Sizemore -- mostly a leadoff hitter throughout his career with Cleveland -- is in the lineup, Brantley will hit in the lower third of the order.