Di Canio admitted he approached the official because Olivier Giroud appeared to be wasting time as he hobbled off the pitch.
He said: "I was never calmer than today. But I tried to protest because we could lose two minutes at the end when their player was injured. A ball can go into the box and anything can happen.
"He said if you keep going I send you off to the stand. I said if you want to complete a perfect day, then send me off, he said now you go off to the stand.
"I am sure he is a nice man."
For the big stories and the banter follow us on Twitter: @tribalfootball