Southampton sign Duje Caleta-Car from Marseille for £10m
Southampton have signed of Croatia centre-back Duje Caleta-Car from Marseille for a fee believed to be around £10million.
The 25-year-old has agreed a four-year contract with the south coast club.
Hasenhuttl said: "Duje is already a very established and experienced player, who has done an impressive job at his previous clubs.
"He is a big presence on the pitch and he will bring even more quality into our centre-back group. It is important we have good depth and options in this position, and he gives us another very strong one."
Caleta-Car said: "It was really a crazy day. I'm very excited because I spoke with the coach, I think he is a good coach and of course the team - I watched them against Chelsea and in the games before.
"I know the way they play, they have a lot of young players, so I think I can come good in the group and be with them every day, to progress with them together."
On a busy day for the Saints they also signed 18-year-old defender Juan Larios from Manchester City on a five-year contract.
Southampton manager Hasenhüttl said: "Juan is a talented young player who has shown he has the technical qualities and personality to improve our team.
"This is a positive step in continuing our way of signing young and hungry players with a desire to get better with us.
"We hope to be able to give Juan the opportunity to play Premier League football, and his adaptability in being able to play in different positions can definitely help us this season and in the future."
Juan Larios said: "I'm so happy to be here in Southampton. I'm really looking forward to starting with the team.
"I like the philosophy of the club, to develop young players and trust them. I was talking with the manager and the club, and they showed me how brave they are. They told me they believe in me, for now and for the future."