While AI defending is present, truly elite players master manual defending. Avoid constantly holding the 'Contain' button (R1/RB) as it can leave gaps. Instead, use 'Jockey' (L2/LT) to stay in front of attackers and cut off passing lanes. Only commit to a 'Standing Tackle' (O/B) when you are sure to win the ball.
Mastering 'Player Switching' (L1/LB or Right Stick) is crucial to quickly select the correct defender. Learn to anticipate passes and runs, positioning your defenders proactively. Don't be afraid to bring midfielders back to help defend, especially against counter-attacks. The 'Second Man Press' (R1/RB) can be useful but use it sparingly to avoid pulling players out of position.