Vlaar admits that 'things have changed' since Sherwood took over and hinted that he might not be ready to end his stay at Villa Park.
"He's got every opportunity to stay," said Sherwood.
"If there's a contract decision to be made, whether he stays at this club or joins somewhere else, we're going to make an adult decision.
"Ron is a man of a lot of experience now and I'm sure we will have a quite honest and frank decision to make."
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