Ajax have completed the signing of Heiko Westermann from Real Betis on a two-year-deal.
The centre-back had a year remaining on his deal at the Liga side, but has made the switch to Amsterdam on a free transfer.
"I am very happy with my contract at Ajax," the former Germany international told the club's official website.
"We had a great chat last week and I immediately knew that I wanted to join Ajax. It's fantastic that it's all gone this quick.
"Ajax are a great club with a world-famous philosophy. It's a young team with a lot of big talents. I hope to be able to help them with all my experience, having played in the Bundesliga and in Spain.
"I want to win the Eredivisie title here."
Westermann becomes Ajax's third signing ahead of the 2016-17 campaign, with Davinson Sanchez and Mateo Casierra having moved to the Amsterdam ArenA.
