The Villans had to battle to survive in the Premier League under boss Paul Lambert last season - eventually finishing five points clear of the bottom three in the Dutch defender's first term in England.
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"The general feeling among the team is that we're getting better," the centre-back told the press. "The feeling in the group is we are developing and progressing all the time.
"It's now about pushing forward together.
"We certainly have a good resilience now. That's a good thing. That's been shown this season already.
"We're more solid as a team. We're more together on the field. That's a very good thing."