The 54-year-old coach was confirmed until June 2022 after a successful second half of the 2019-20 campaign.
Looking back at the season, Pioli was proud of the results in 2020 and said there was an obvious change at Milanello when Zlatan arrived in January.
“In 2020, only Atalanta picked up more points. We only lost the derby, after a great first half,” Pioli told La Repubblica.
“Not everything goes smoothly in a season. But he makes everything easy. It’s wrong to refer to his age, he’s 100 per cent professional. He taught the young players about seriousness, competitiveness in every single training session".