Former Feyenoord captain Vlaar is convinced his best years are ahead of him after committing himself to Villa until the end of the 2014-2015 campaign and wants to bring success back to the club after two poor seasons.
He said: "This is a dream come true for me.
"With my past, I am very proud but I always look forward and this is a great opportunity. I am very happy that Villa have given me this chance.
"For me, I want to play a lot and improve my play and do well with the team. That's most important.
"I am 27 years old and I know my best years are ahead of me. I feel fit and strong and I am looking forward very much to playing my first game.
"I know some of Villa's history and I have been in the stadium already and saw all of the pictures of great achievements. I really believe we can bring the happiness back.
"I think there is a lot of quality here and, if we play like we can as a team, we will make it difficult for other teams to beat us."