Liverpool and both have ahead of this weekend's games.
Liverpool's - and United's Lisandro Martinez and Kobbie Mainoo - are all walking a disciplinary tightrope, with league rules stating that one more booking will see them miss the next match.
is set to take on Aston Villa at Anfield on Saturday, while United welcome Leicester to Old Trafford on Sunday. Liverpool boss will be particularly wary of Mac Allister picking up another yellow, which would rule him out of the Reds' clash with Southampton following the international break.
The Argentinian has been instrumental in Liverpool's midfield this season, featuring in all 10 Premier League games and playing a key role in the club's current top spot standing. Meanwhile, United's caretaker manager Ruud van Nistelrooy will oversee his final game against the Foxes before new head coach Ruben Amorim takes the reins on November 11.
The Portuguese will be keeping a close eye on proceedings, as any misstep from Mainoo or Martinez could see them sidelined for his first match in charge - an away fixture against Ipswich Town on Sunday, November 24.
While Mac Allister has been a key part of Slot's midfield, the World Cup winner has picked up his four yellow cards in consecutive fixtures. Games against Brighton, Arsenal, Chelsea, and Crystal Palace saw the 25-year-old earn a place in the referee's book.
Players who receive a total of five yellow cards in their first 19 games are given a one-match suspension. Chelsea's Nicolas Jackson became the latest player to join a group of 23 players, all walking on thin ice when he picked up his fourth against United last weekend.
The list of players in danger of suspension also includes Newcastle trio Fabian Schar, Joelinton and Dan Burn, and Spurs' Micky van de Ven. Bournemouth players Ryan Christie, Justin Kluivert and Antoine Semenyo are also at risk.
Should a player be booked 10 times across their first 32 Premier League matches, they will be suspended for two games. However, yellow cards are not carried over to the EFL Cup or FA Cup.
Liverpool will be aiming to stretch its lead at the summit of the Premier League when it hosts Villa at Anfield. However, Unai Emery's men will be looking to disrupt Liverpool's plans and bounce back from a run of just one victory in their last five league matches.
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