Vermaelen: Premier League a big circus
The Gunners begin their group phase adventure away to Standard Liege on Wednesday night, the side who came close to eliminating Liverpool from last season's competition, before knocking Everton out of the UEFA Cup.
“The Premier League is the biggest league in the world," he said.
"What happens there, everybody is looking at, and sometimes, yes, it can be a big circus.”
The 23-year-old has made an impressive start to his career with the Emirates Stadium outfit, netting on his debut in the 6-1 mauling of Everton on the opening day of the campaign, before helping Arsene Wenger's outfit win their next three matches.
And the Belgium international - who has 21 caps for his country - admits he is looking forward to returning to his homeland and playing in Europe's premier club competition, after his former club Ajax failed to qualify 12 months ago.
“Last year Ajax missed the Champions League because we were not ready to play in it as a team," he said.
"We were young players and it was difficult. But you always want to play at the highest level."