Key indicators of an opponent's tactical adjustments include noticeable changes in formation, player positioning, and assignment during the game, such as shifting from a defensive to an attacking setup or vice versa. Observing their press intensity—whether they increase or decrease pressure on the ball—can signal a tactical shift. Additionally, alterations in the frequency and type of passes, particularly if they start focusing on long balls or quick transitions, can indicate a change in approach. Substitutions often reflect tactical adjustments, especially if they involve bringing on more attacking or defensive players. Finally, body language and communication on the field, including increased gesturing or vocal instructions, can signify a collective strategy change among the players.