The result sees Milan reach the Europa League quarterfinals 7-3 on aggregate as Rafael Leao, Christian Pulisic and Ruben Loftus-Cheek struck on the night.
"We are in shape, and it's a positive moment," said Pioli. "These three players must reach these figures because they have these qualities. Although these rounds were easy on paper, both Rennes and Salvia were tough opponents."
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On Leao, he also said: This must be his standard.
"Let's be clear. It's up to him now. We've done everything we could, and he's been available. Now it's up to him because he has everything: experience, quality and strength. I hope he's strong enough mentally always to have this approach."