The Arsenal defender equalised against Tottenham Hotspur this weekend.
The former midfielder believes Mathieu Flamini changed the game for Arsenal after being introduced at half time.
Tottenham Hotspur's Jan Vertonghen and Arsenal's Olivier Giroud were involved in an off-the-ball dispute during the North London derby.
The Liverpool legend questioned one of the goalkeeper's moments against Palace.
Erik Lamela has improved considerably at Tottenham Hotspur, under the guidance of Mauricio Pochettino.
The defender says they are determined to put in a title challenge this season.
Mousa Dembele shone for Tottenham Hotspur against Arsenal.
Arsenal and Tottenham Hotspur played out a 1-1 draw at the Emirates Stadium in the Premier League on Sunday evening.
Arsenal legend Thierry Henry makes no apologies for how he feels about Tottenham.
Gary Neville says Tottenham's defending is a cause for concern.