"When it comes to a derby I think it was a good result - Chelsea are not an easy team to beat, they have excellent players," he told arsenal.com.
"I congratulate our squad for their fight and now we need to work hard to carry on winning.
"We need to qualify for next year's Champions League. We need to finish well and carry on next year to compete for the title.
"This is a big club and deserves better. All we want are trophies."