Most grassroots coaches notice that players don't communicate and then tell them to communicate more. This produces a brief improvement followed by reversion to silence. The reason: communication is a habit, and habits require structured repetition in a lower-stakes environment before they transfer to matches.
Why players don't communicate
Three main reasons: they haven't been given specific words to say, they feel self-conscious calling loudly in front of peers, or the game moves too fast for them to process communication as a separate action. The fix addresses all three.
Building the vocabulary first
Give players specific words for specific situations. Five calls covers 90% of in-game communication needs: MAN ON (defender close behind), TURN (space to turn), MINE (GK claiming), AWAY (clear it), HOLD (keep the ball, don't play). Practise these calls in isolation before using them in drills.
The drill that forces communication
The Reactive Passing Square drill has a specific rule: you cannot pass to a player who hasn't called for the ball. This makes communication mandatory, not optional, and creates 50+ reps of the calling habit in 10 minutes.
The rule "name then ball, every pass" is simple enough for U9 and up, and the drill runs continuously enough that the habit forms within the session.
Age-specific notes
U7–U9: "Call for the ball" is sufficient vocabulary at this age. Don't introduce tactical calls (MAN ON, TURN) before U10.
U12+: Add GK communication explicitly. A GK who calls KEEPER and AWAY prevents the majority of defensive aerial mix-ups. The GK Command of the Box drill trains this specifically.