This is the 3747th most frequent Russian word.
футболисты
Football players.
Here, 'футболисты' is the subject of the sentence and represents the group of people (football players) performing the action of training.
Футболисты тренируются на поле.
The football players are training on the field.
Here, 'футболистов' is in the genitive case, showing possession or association with the action or object (the game).
Я наблюдаю за игрой футболистов.
I am watching the football players' game.
In this sentence, 'футболисты' serves as the subject and is modified by the adjectives 'наши' (our) and 'молодые' (young), highlighting its role as the main actor of the verb 'выиграли' (won).