Vermaelen, who have played just 10 minutes in the Premier League this season, is ready to leave the Gunners if his World Cup chances are affected by a lack of playing time.
"I'll have to think about that when it's necessary. January is still a few months ahead. Of course, never playing will not be the ideal situation for me to go to the World Cup, that's for sure," Vermaelen told the Daily Mail.
"People ask me if I panic because I'm not playing a lot but I'm not.
"I have spoken to the manager but it will remain private between us. Things can happen in a split second and change my situation. That can happen tomorrow or next weekend.
"In that case, we will speak differently in January. I have to be ready for that."