Milan lead the tie 3-0 from the first-leg.
Pioli said: "I don't like the term rotations.
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"There is the management of a team, of a group, of players who have to play 5 games in 15 days. The choices also depend on the data and I will also base myself on this tomorrow.
"Then starting with tomorrow night I will start thinking about the match against Atalanta."