The 20-year-old Denmark international underwent a medical on Thursday and has agreed a four-year deal with Villa.
Okore told www.avfc.co.uk: "I know there is great potential in the team. I have watched many of our games because the Premier League is very popular back in Denmark. I know also that we have a good coach and this is a really good club. This is the right club for me, I feel it straight away."
- Sports & Recreation