The Belgian won the FA Cup in his last game for the Londoners, but then tore his hamstring at the 2014 World Cup in Brazil, and has only recently made his debut for Barcelona, nearly a year after he signed for the La Liga giants, having struggled to return to fitness.
While the season has been very successful for the Catalonian club, the former Gunners captain has been unable to play a part in that success, instead looking on from the sidelines until the last league match of the season, a 2-2 home to Deportivo La Coruna.
It left the 29-year-old declaring this last season as the worst in his career.
“It is a bit strange. I haven’t been involved the whole season it has been a difficult year for me because of the injury," Vermaelen told Sky Sports News. "In the end I am very happy to be back and I made my debut at the end of the season so I am very pleased with that.
“Of course it has been the worst time of my career, not only because of the injury but as you say when you come to a new club and you want to show yourself and show people what you are capable of and you can’t do that because of the injury and that is very difficult. On top of that you need to adapt to the new culture, new city. It has been hard but in the end I have made it and I am happy to be here.
And though he could yet feature in this year's biggest game, the Champions League final against Juventus at the weekend, the centre back revealed he didn't have any positive memories or expectations of his first year in Spain.
“I don’t expect a lot this season," he added. "I have been out for the whole year, so my expectations are not very high. For me I need to forget this season and go for it next year."