The bookie makes it 8-1 there is a red card in each of the games, with the longer odds offered about all four sides ending the game at least a man down.
Anyone who thinks the bad blood will spill over on to the touchlines can take 10-1 a manager is sent to the stands in either match while bets can also be placed on the first player to be cautioned in the early kick-off, with Gareth Barry the 8-1 favourite.
Following Liverpool's epic midweek penalty shoot-out in the Capital One Cup the book is also open on how many spot-kicks will be awarded in their crunch clash with exactly one offered at 4-1. It's 10-1 a player misses a penalty and 33-1 both sides put one away.
Mario Balotelli is also sure to be the centre of attention in the early kick-off but the betting suggests he's more likely to be a hero on the day (7-1 to score the winning goal) than a villain with 16-1 the price he sees red at any stage. Bet365 offer 20-1 on that one.
Both Liverpool (17-20) and Arsenal (4-5) are odds-on for their respective matches but Ladbrokes will enhance them to 3-1 in a special double offered for digital customers.