Tactical modifications by Manchester United (MU) have been a key factor in their success over the years, and they continue to adapt to modern football with innovative tactics. One such modification is the use of wing-back systems, which have become increasingly popular in recent seasons.

The wing-back system involves playing two fullbacks as defensive midfielders, who cover both wings and provide width for the attacking players. This approach allows MU to maintain a high line of play while also providing additional protection from the back four. The wing-backs can then push forward to create space for the forwards to run into, while also providing a physical presence on the ball.

Another tactical modification that MU has adopted is the incorporation of the three-man defense. This system involves having three central defenders who act as a wall between the goal and the attackers. The defense is supported by two wing-backs who provide additional cover and movement on the flanks. This system has been particularly effective against opponents who rely heavily on set-pieces or counter-attacks.

In addition to these modifications, MU has also experimented with different formations and systems throughout their history. For example, during the early days of the Premier League, MU played a 4-2-3-1 formation, which was known for its fluidity and ability to transition between different styles of play. More recently, MU has shifted towards a more compact and defensive-oriented style of play, with a focus on possession-based football and a strong emphasis on defense.

Overall, MU's ability to adapt to modern football and experiment with new tactics has been one of the keys to their success. By constantly evolving and refining their approach, MU has been able to stay ahead of the curve and remain competitive at the highest level of English football.