Chelsea and Arsenal played out a goalless draw at Stamford Bridge on match day five in the Premier League on Sunday afternoon.
Nigeria international Victor Moses looked very lively and productive in the opening 30 minutes.
But the right wing-back was guilty of making a defensive error in the 38th minute when he missed a kick on the edge of his own box which allowed Koscielny to strike the ball over the bar.
The best chance of the half fell to Aaron Ramsey who went on a mazy run before hitting the post on 41 minutes, and Alexandre Lacazette had a great chance to score from the rebound, but his volleyed effort failed to hit the target.
On 75 minutes, Granit Xhaka crossed the ball into the box from a free kick and Mustafi had the ball in the net but the goal was ruled out for offside.
Alex Iwobi had an encouraging performance before making way for Mohamed Elneny with ten minutes left on the clock.
David Luiz received a straight red card in the 87th minute for committing a rough foul on Sead Kolasinac but there was not enough time for Arsenal to capitalize on their one-man advantage.