In January 2019, Mitrović was signed by Monaco from Dinamo Zagreb for €5 million. He made his debut on the 8th day of the season and scored his first goal in the 4-0 victory over Rennes. His performances were so impressive that he became a regular starter in the following matches.
One of Mitrović's most notable achievements with Monaco was his 16-goal tally during the 2019-2020 season. This record remains the club's highest single-season goal-scoring total. In addition to scoring goals, Mitrović also contributed to the team's defensive efforts as well, having made 2 assists and 1 clean sheet.
Mitrović's performance has been recognized by various football organizations. In November 2019, he was named in the UEFA Europa League Team of the Season, and in May 2020,Bundesliga Tracking he won the Ligue 1 Golden Boot award after scoring 17 goals.
Mitrović's success with Monaco is not just limited to his personal accolades. The club has benefited greatly from his contributions. Under his leadership, Monaco finished in third place in the Ligue 1 table in the 2019-2020 season, qualifying for the UEFA Champions League for the first time in their history.
Overall, Mitrović's success at Monaco has been nothing short of remarkable. His performances have helped the club achieve great heights both domestically and internationally. With his continued efforts, it is likely that Mitrović will continue to be a key player for Monaco for many years to come.