Monaco's impressive victory over Montpellier in the French Ligue 1 on Sunday night was secured through a crucial header goal from goalkeeper Didier Deschamps' substitute, Yannick Gagneux. This decisive strike sealed Monaco's 3-2 win and sent them to the top of the table.

The match started with Montpellier looking to break the deadlock, but Monaco managed to control possession and create several chances. In the 58th minute, Montpellier broke the deadlock when their forward Antoine Griezmann scored his first goal of the season. However, Monaco quickly responded and扳平比分。In the 77th minute, Monaco's striker Dusan Vlahovic netted a second goal to level the score at 2-2.

With the game tied, Monaco needed a late winner to secure the three points. The crucial moment came in the 90th minute when Deschamps made a substitution for the injured defender Romain Laporte. He brought on Yannick Gagneux, who had been sitting on the bench since the beginning of the game.

Gagneux stepped up to take a shot from the edge of the box and headed it into the back of the net, giving Monaco a winning margin and securing their third place in the league standings. His header was not only a crucial goal but also a testament to Deschamps' tactical vision and his ability to make key substitutions at critical moments.

This victory is significant for Monaco as they now have a strong chance of qualifying for the Champions League next season. It also gives them hope that they can continue their impressive run in Ligue 1 this season. With the loss of Romain Laporte, Deschamps had to be resourceful in making substitutions and Gagneux proved to be a valuable addition to the squad.

Overall, Monaco's victory against Montpellier was a hard-fought one, but Deschamps and his team were able to capitalize on a crucial moment in the game. Gagneux's header goal was a highlight of the match and will likely be remembered as one of the most important goals of the season so far.