Aaron Ramsdale got a boot to Sessegnon's strike.
The Spanish midfielder was heavily involved in all three goals against Real Madrid on Sunday.
Ramsdale had an altercation with Richarlison, after the goalkeeper celebrated Arsenal's win, before a fan came down from the stands.
The Spurs forward rejected Gabriel Martinelli's gesture, but later apologised for his actions.
One Spurs fan may not have known how to behave but the Arsenal fan was happy to watch his side win amongst his rivals.
The pair managed to clash despite neither actually being on the pitch at the time.
Arsenal are currently eight points clear at the top of the Premier League table
Arsenal beat Tottenham Hotspur 2-0 to go eight points clear at the top
Arteta was having flashbacks.
Arsenal ran out 2-0 winners during Sunday's clash away at Spurs.
Manchester City lost 2-1 against Manchester United on Saturday
Arsenal have done the double over their bitter rivals.
The Ukrainian winger joins Chelsea on an eight-and-a-half-year deal from Shakhtar Donetsk.
Wout Weghorst's Manchester United squad number has been revealed and it's got fans thinking about a former player.
The North London derby is underway with Arsenal leading
Pique vs Shakira is already the best feud of 2023.
Manchester United got the better of neighbours Manchester City on Saturday afternoon
Mitrovic had a glorious chance to give Fulham the lead.
Pep Guardiola called Phillips out over his weight after the Manchester City midfielder returned from the World Cup.
Chelsea have officially announced the signing of Mykhaylo Mudryk from Shakhtar Donetsk
Arsenal chased Mudryk for a long time.
The full-back has been criticised online.
Mudryk looked certain to sign for Arsenal before Chelsea's later intervention, and the Gunners' fan summed the situation up perfectly.