8 essential terms explained
A statistical measure of the quality of scoring chances. Each shot is assigned a probability (0 to 1) of being a goal based on factors like distance from goal, angle, body part used, and type of assist. An xG of 0.3 means the shot has a 30% chance of becoming a goal. Developed using machine learning on hundreds of thousands of historical shots.
If a team has an xG of 2.1 but scored 3 goals, they overperformed their chances. If they had 2.1 xG but scored 0, they were unlucky or poor at finishing.
Technology system where match officials review decisions using video footage. Introduced to correct "clear and obvious errors" in four categories: goals, penalties, direct red cards, and mistaken identity. A team of officials watches multiple camera angles in a video operations room.
A goal might be ruled out after VAR review shows the scorer was offside by centimeters. Penalty decisions are frequently reviewed for handball or simulation.
A player is offside if they are nearer to the opponent's goal line than both the ball and the second-last opponent (usually the last defender) at the moment the ball is played to them. Being offside is not an offense in itself — the player must be involved in active play. The rule prevents goal-hanging and encourages attacking build-up play.
If a striker is 1 inch beyond the last defender when a through ball is played, they are offside — even if they look level to the naked eye. VAR now checks using calibrated lines.
When a team concedes zero goals in a match, the goalkeeper and defense are credited with a clean sheet. It's a key metric for defensive quality and is tracked as a season statistic for goalkeepers.
Arsenal's David Raya has 14 clean sheets in 2025-26 — the most in the Premier League. In Fantasy Football, goalkeepers earn bonus points for clean sheets.
A metric measuring pressing intensity. It counts how many passes the opposing team completes before the pressing team makes a defensive action (tackle, interception, or foul). Lower PPDA = more aggressive press. A PPDA of 7 means the opponent can only string together 7 passes before being pressured.
Liverpool under Klopp had a PPDA around 8-9, showing intense pressing. A team sitting deep might have a PPDA of 15+.
A tactical innovation where the center forward drops deep into midfield, creating space for wingers or midfielders to exploit. The "false" part refers to the striker appearing to play as a number 9 but actually functioning as a number 10 or even 8. Popularized by Pep Guardiola with Lionel Messi at Barcelona.
When Messi played as a false 9 in the 2011 Champions League final against Manchester United, he dropped so deep that center-backs didn't know whether to follow him or hold their line.
The tactic of immediately pressing to win the ball back after losing possession, rather than retreating into defensive shape. The idea is to catch the opponent disorganized in the 5-8 seconds after a turnover. Pioneered by Ralf Rangnick and popularized globally by Jurgen Klopp.
When Liverpool lose the ball, they have 5 seconds to try to win it back. If they can't, they regroup. This creates turnovers in dangerous areas and is why teams struggle to play out from the back against pressing sides.
The difference between goals scored and goals conceded. Used as the primary tiebreaker in league standings when teams are level on points. Calculated as: Goals For minus Goals Against. A positive goal difference means you've scored more than you've conceded.
If Arsenal have scored 60 and conceded 20, their GD is +40. If Liverpool have 58 scored and 22 conceded, their GD is +36. If both teams finish on the same points, Arsenal finish higher.