Koscielny, who joined the Club from Ligue 1 outfit Lorient last summer, admits he has had to work hard to adjust to the requirements of the Premier League.
“I think for a defender it is the best championship,” he told Arsenal Player. “I have had a bit of time now to be strong and get to know this league.
“Now I feel good on and off the pitch and I try to put the effort into being a good defender.
“You don't have to play differently here, you just have to work on the physical side. It's very different to France or Spain and the strikers are very strong. I've worked a lot to do that.”