Monaco's 4-2-3-1 formation is a tactical system that has been employed by the team throughout the season, and it has become increasingly important as they look to improve their play on the pitch.

The formation consists of four central defenders, two left-backs, one right-back, and three midfielders. The defensive line is composed of three defenders (one on each side) and two midfielders, with the goalkeeper at the other end.

The key role of Ben Yedder in the formation is to create space for the forwards to move forward, and he uses his experience and ability to control the ball from behind. He also provides support to the attacking players, allowing them to move quickly and take advantage of opportunities.

One of the most impressive aspects of the formation is its versatility. It can be used in different formations depending on the opponent's style of play, and the coach can adjust the personnel accordingly to achieve the desired results.

Another aspect of the formation is its adaptability. Monaco has had to change their formation several times this season due to injuries or changes in the squad, but the coaches have always found ways to adapt the system to fit the current situation.

Overall, the 4-2-3-1 formation is a strategic decision made by the coaching staff, and it has been successful in helping Monaco to perform well both defensively and offensively. With the new season coming up, it will be interesting to see how the team adapts to the changes in the system and how they use it effectively in their upcoming matches.