The Ghanaian has been one of the Rojiblancos' top men this season, having played in all games since serving a suspension on matchday one of La Liga.
"[Rotation] has improved the level of competition within the team," Simeone told the press.
"[Players like] Lucas, Thomas, Gaitan and Vietto have raised their level.
"We have always thought that [rotation] would give us the opportunity to choose the player that suits us best for each game and for the moment we are trying [to do so].
"That will improve the team in the future."
Partey was a peripheral figure of Simeone's set-up in the past seasons.
Following loan spells at Mallorca and Almeria, he was drafted into the Rojiblancos in 2015-16 where he made 13 league appearances involving three starts.
He improved his stats last term with 16 topflight outings, six of which he featured from the blast of the referee's whistle.