Tottenham Hotspur and Aston Villa meet at Tottenham Hotspur Stadium at 12:30 BST on Saturday with an interesting VAR appointment before a ball has even been kicked.
Sam Barrott will referee the match, assisted by Adam Nunn and Lee Betts. John Brooks is on VAR duty, with Ian Hussin as assistant VAR. 
Brooks moves from the pitch to the VAR room
Seven days ago, Brooks was the on-field referee for Sunderland v Arsenal.
He awarded Sunderland a penalty in the 54th minute after judging Ezri Konsa to have held Dan Ballard at a corner. VAR checked the incident and confirmed the decision. David Raya saved Enzo Le Fée's penalty, but the call became one of the weekend's biggest refereeing talking points.
The Premier League Match Centre said Brooks believed Konsa was holding Ballard while facing away from the ball, with VAR agreeing that the contact amounted to a holding offence.
Arsenal strongly disputed the decision, but it is important to separate controversy from an established error. The decision was checked and confirmed by VAR and has not been officially overturned or declared incorrect.
VarVote examined the incident in the latest VAR Weekend Review. 
Villa have already been involved in a confirmed VAR error
Aston Villa were involved in one of the Premier League's confirmed missed VAR interventions earlier this season.
During Villa's 1-0 defeat to Arsenal on 31 August, Ian Maatsen challenged Bruno Guimarães inside the penalty area in the 98th minute. No penalty was awarded and VAR did not intervene.
The Premier League's Key Match Incidents Panel later voted unanimously that both decisions were incorrect. It concluded that Maatsen made clear contact with Guimarães' standing leg without playing the ball, that a penalty should have been awarded and that VAR should have recommended an on-field review.
The panel also felt Maatsen's challenge was reckless and should have resulted in a second yellow card.
That finding is particularly relevant because the Premier League continues to operate with a high threshold for subjective VAR intervention. In this case, the panel concluded that the threshold had clearly been reached.
Spurs benefited from a VAR overturn against Forest
Tottenham have also been involved in a significant VAR intervention this season.
Nottingham Forest's Neco Williams appeared to score against Spurs on 5 September, but VAR identified that the ball had touched Williams' arm immediately before he scored. The goal was disallowed for attacking handball.
The KMI Panel unanimously supported the intervention, voting 5-0 that overturning the goal was correct.
Because the handball by the goalscorer was treated as a factual decision, the referee did not need to use the pitchside monitor.
What should we watch today?
Holding inside the penalty area is the obvious place to start. It is one of the Premier League's refereeing points of emphasis this season, and Brooks was at the centre of exactly that kind of decision only a week ago.
The wider question is the intervention threshold. Brooks is not there to re-referee every subjective decision Barrott makes. For most incidents, VAR should intervene only when there is clear evidence of a match-changing error.
That distinction has already affected both clubs this season. Villa were involved in a non-intervention the KMI Panel later said should have been corrected. Spurs benefited when VAR found a factual handball and removed a Forest goal.
There is no guarantee VAR will play any major role today. But if Tottenham v Aston Villa produces a close penalty call, handball or disputed goal, there is already plenty of recent context behind the officials making the decision.
For more on checks, reviews and the intervention threshold, read VarVote's guide to how VAR works.