Cuco Martina has become the latest player to join Everton this summer - and the defender revealed it was the club's "big ambition" shown in the transfer market that convinced him to join on a free transfer.
Martina has 30 global caps for the Caribbean former Dutch colony of Curacao, who were knocked out of the CONCACAF Gold Cup on Sunday.
'Obviously, I know the manager from my time at Southampton, so I know what he wants and he knows what I can do'.
Martina made 36 appearances over two seasons with Saints and scored just once, although it was a stunning long-range strike in a 4-0 victory over Arsenal in 2015.
"Everton supporters are really passionate about their club and everyone is excited about where the club is aiming".
Netherlands-born Martina, who captains Curacao at global level, becomes the Toffees' seventh summer signing, joining Wayne Rooney, Sandro Ramirez, Henry Onyekuru, Davy Klaassen, Jordan Pickford and Michael Keane at the Premier League club.
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The Toffees boss even wanted to sign Martina last summer but saw a £1.6m bid rebuffed by the Saints.
"When you come to a new club, you need to get to know one another so the training camp in Holland will be great for me and for the other new players as well".
"Cuco Martina is an experienced player who can perform in different positions at the back, which is important", Koeman said. It's also important, with the number of games we will face in the coming campaign, that we have strength and competition in the squad.
Koeman is expected to deploy Martina in Seamus Coleman's absence as the full-back continues his recovery from a season-ending leg break in March.
"I brought the player to Southampton, so I know what he can do for us here and this is why I've now brought him to Everton".