A football manager can influence a match without touching the ball. Tactical changes, substitutions and instructions from the touchline can completely alter the direction of a Premier League contest. A manager might change formation to protect a lead, introduce an attacking player to chase an equaliser or move a midfielder into a different position to regain control. The best managers also understand how to respond when their original plan is not working. Football is unpredictable, but preparation can give teams an advantage. That is why managerial decisions remain such an important part of the modern game, particularly during closely fought Premier League matches.