Manchester City boss Manuel Pellegrini says it will not be easy for his team to retain the English Premier League title.
The Chilean was visibly upset with referee Mark Clattenburg saying that the referee was too lenient to wave play on when the Gunners scored both their goals.
"It was a great game between two great teams who always try to play - both teams are very creative," Pellegrini told BT Sport's Ray Stubbs.
"Today I think that both Arsenal goals were very clear fouls – for the first one, it was two or three fouls continuous fouls on Aguero and the second one Welbeck pushed Kompany with no intention of playing the ball and then it was a goal.
"The only other doubt is that we were denied a clear penalty for a handball.
"Last season, it was Skrtel with a fist for Liverpool in the six-yard box and today it was Wilshere with two hands on the ball inside the box right in front of the linesman and no penalty was given."
Later on in the day Chelsea were rampant in what was their fourth consecutive win of the season and the Citizens are already six points from the top of the table.
And Pellegrini believes it will be difficult to confirm last season's success in the Premier League.
"So I’m satisfied with a draw but, I repeat, it will be very difficult for us to retain the title.
"It will be very hard [to retain the title] because all the teams want to beat us – I think that we have difficult decisions from the referee, not just today but in the last game against Stoke where we were denied a clear penalty."