diff --git a/tournament/serializers.py b/tournament/serializers.py
index cb8054f..c17525b 100644
--- a/tournament/serializers.py
+++ b/tournament/serializers.py
@@ -7,6 +7,7 @@ class TournamentSerializer(serializers.ModelSerializer):
 	level = serializers.ReadOnlyField()
 	started = serializers.ReadOnlyField()
 	finished = serializers.ReadOnlyField()
+	name = serializers.CharField(default="")
 
 	class Meta:
 		model = TournamentModel
@@ -20,3 +21,18 @@ class TournamentSerializer(serializers.ModelSerializer):
 				break
 			levels.append(level)
 		return levels
+
+	def validate_nb_players(self, value: int):
+		if (value < 2):
+			raise serializers.ValidationError("The numbers of players must be greather than 2.")
+		return value
+
+	def validate_nb_players_by_game(self, value: int):
+		if (value < 2):
+			raise serializers.ValidationError("The numbers of players by game must be greather than 2.")
+		nb_players: str = self.initial_data.get("nb_players")
+		if (nb_players is not None and nb_players.isnumeric()):
+			nb_players: int = int(nb_players)
+			if (value > nb_players):
+				raise serializers.ValidationError("The numbers of players by game must be smaller than the numbers of players.")
+		return value
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