The Gunners ended the Barclays Premier League campaign with an astonishing undefeated run of eight wins from the final 10 matches to move back ahead of north London rivals Tottenham and seal a top-four finish following the 1-0 victory at Newcastle.
Arsenal will, of course, still have to negotiate a potentially tricky two-legged qualifier in August before they can focus on a remarkable 16th campaign of elite European football.
However, with that now very much on the horizon, the club can move into the summer break with a completely different outlook from the one they faced when slipping seven points behind Spurs after defeat at White Hart Lane on March 3.
France international Koscielny, whose second half goal at St James' Park proved crucial, feels everyone deserves great credit for the superb collective effort over the run-in.
"It is very important for the club to be in the Champions League," he said, quoted on www.arsenal.com.
"The team played well and gave themselves for the team.
"We are all good players and we want to play Champions League. It is a big competition. We did the job and we are happy."