Villa have yet to secure their Premier League status with just one more fixture remaining on their 2012/13 calendar.
A 2-1 defeat to Chelsea on Saturday means they could still be overhauled by 18th-placed Wigan Athletic - if the Latics were to win their last two matches.
Villa are due to face the Latics at the DW Stadium on Sunday in what could be a make-or-break encounter.
Vlaar is, however, adamant that Paul Lambert's side will enter that contest in optimistic mood if they are still sweating on their top-flight status.
He said: "In the last few months we have only lost against top-six teams and beaten all the teams around us.
"If you look through the season, the confidence is a lot better. The way we play is better.
"We were right on top at one stage during the Chelsea game. We definitely deserved some points."