The Dutch international defender insists Villa's players are looking at top half rather than the relegation zone.
Vlaar said: "We are positive and really optimistic going into the remaining games. Fans need to know that too.
"We have great belief. Obviously, we know the situation we are in. But within the camp we feel very calm."
Vlaar added: "We have the character within this team and we've shown that. We showed it last season and that's the same throughout the squad.
"We finished strongly then and we know we can do that again. The belief is there and that's what gives us the confidence. That's why we're optimistic about what we need to do."
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