The 34-year-old Norwegian international defender's present contract expires at the end of this season.
"If I decide to stay in England, it will be at Villa. I enjoy it here but it's not only up to me," he told the club's official website.
"There are other people to consider - the manager and other people at the club, and also my family."
"We'll see, but I enjoy it here and what we have done so far this season is positive. We've laid the foundations and hopefully we can now get the right results," he added.