Problems that can arise if the defenders drop deep include that it can create a lot of space between the midfielders and the defenders allowing the opposition to play between the lines. If the opposition manage to find the striker they can hold the ball up and they will create an overload against the defensive unit. If the defenders do win the aerial ball and do not clear their lines the 2nd ball will be regained by the opposition's midfielders and put them in a position to attack.
to either win possession through interceptions, tackles or forcing the player into a mistake.
Through zonal defending it allows the defending team to become compact and deny passing options to happen in certain areas. Because the defending team are closer together it allows the coach to set pressing traps or areas of the field where teams can surround a player in possession with 3 to 4 players by sacrificing certain zones or areas of the field while still maintaining a defensive balance
Zonal Marking
A type of defending where every man is given a certain
area or zone of the field to mark relative to their team mates. Whenever the ball enters that area or zone players will apply pressure