Tackles are a positioning failure stat
Tackles per 90 is the defensive stat that gets cited most often in Premier League broadcasts as evidence of grit and defensive contribution. A center-back averaging 3.5 tackles per 90 sounds like a worker. A center-back averaging 0.8 tackles per 90 sounds disengaged. The football reality runs almost exactly opposite to the broadcast framing. A high tackle count is mostly evidence that the defender was repeatedly being asked to win one-on-one duels because the team's structure failed to prevent the duel from happening in the first place. The best defenders in the league make very few tackles. The reason they make few is that the attackers never get into the situations where tackles are the available response.
What a tackle is for
A tackle is what happens when an opponent is already in possession and already attacking, and the defender has to win the ball with a physical challenge. The act of having to tackle is, in every case, downstream of a positioning failure earlier in the sequence. Either the defender was out of position, or a midfielder failed to track a runner, or the press got broken upfield and the back four was exposed in space. A defender who tackles a lot is being asked to fix those situations. A defender who tackles a little is being asked to fix fewer of them.
That distinction does not show up in the box score. The tackle is a positive-coded event in the official scoring, and it is. Winning a duel against an attacker is a real defensive contribution. The trap is treating the tackle count as a proxy for total defensive value, when the count is in part a record of how many duels the team's structure forced its defenders to take. Lower is often better. The broadcast graphic does not know that.
The Van Dijk case
Virgil van Dijk in his peak years at Liverpool routinely posted tackle numbers below 1.0 per 90, which would put him below the median for Premier League center-backs. He was also the best center-back in the league. The reason the numbers looked low is that Liverpool's press and structure produced very few situations in which Van Dijk had to make a tackle. Attackers either could not turn on him because of his initial body position, or could not run at him because the midfield denied the line of pass, or were already shepherded toward the touchline before they arrived at his zone.
Center-backs at Burnley or Sheffield United, by contrast, regularly posted tackle counts of 3.0 to 4.0 per 90 because they were defending a much higher volume of attacks at much higher danger. Their tackle totals reflected the workload their team's structure dropped on them. None of those defenders were better than Van Dijk. Several were on Championship-caliber rosters. The tackle column flatters them. The match film does not.
The interception cousin
Interceptions sit one rung up the defensive sequence from tackles. An interception is the defender stepping in front of a pass before the attacker takes possession. The act of intercepting a pass is itself partly a positioning event: the defender reads the developing pass, occupies the line, and takes the ball cleanly. Interceptions correlate weakly with team-level defensive quality, but they correlate much better than tackles do, because they capture more of the anticipatory side of defending.
Still, even interceptions are partial. The defender who reads the pass two seconds earlier and signals the midfielder to cut the line, so the pass is never attempted, gets credit for nothing. The pre-defensive action that prevented the attack is invisible to the event-data feed. The defender who let the pass be attempted and stepped in late gets the interception. The two players just played the sequence at different levels of defensive quality, and the stat reads the worse one as the better contributor.
What pressures actually map to defending
The closest available public stat to a real defensive contribution measurement is pressures, particularly successful pressures applied in the opponent's third. A pressure that forces a hurried clearance or a misplaced pass is a defensive action that prevented an attack from building. Counted that way, pressures get closer to the question the tackle column is pretending to answer. They are not perfect either, because pressing is itself a system-dependent behavior whose volume reflects the manager's instruction more than the player's defensive judgment.
Beyond pressures, the modern public toolkit includes successful tackle percentage, which adjusts for failed attempts; dribbled-past, which penalizes defenders who lose the duel; and progressive carries against, which captures how often opponents broke through a defender's zone with possession. None of those numbers is on the broadcast graphic. All of them are on Opta's professional feed, and all of them are part of how the front offices doing the scouting actually evaluate defenders.
The midfield mirror
The same logic applies to defensive midfielders, with even more distortion. A holding midfielder averaging 5.0 tackles per 90 sounds dominant. A holding midfielder averaging 1.8 tackles per 90 sounds invisible. Rodri at Manchester City has spent multiple seasons under 2.0 tackles per 90 and won every individual midfielder award available. The explanation is the same as for Van Dijk: the structure of the team and the positional discipline of the player produce a game state in which tackles are rarely required, because the developing attacks are killed at the anticipation stage.
A holding midfielder with 5.0 tackles per 90 is often a player whose team's structure leaves him constantly scrambling between zones, picking up runners that the line in front of him failed to track. The count records the worker. The film records the structural failure that created the work.
The honest read
Tackles are best read as a workload stat with a confounded skill signal embedded in them, not as a defensive impact stat. A high tackle count means a defender was put in many positions where a tackle was required, which is often a property of the team's structure and the opponent's attacking volume. The defenders who post the lowest tackle totals on contending teams are frequently the ones doing the most to keep the opponents from arriving in the defensive third at all. The stat that ends a column on a broadcast graphic and the stat that ends a recruitment meeting are not the same thing. The recruitment meeting usually wins, eventually. The broadcast graphic keeps showing the tackle count, because it sounds like defense and you can read it without footnotes.