Newcastle have secured the signing of goalkeeper Martin Dubravka on a four-year deal.
The Slovakian, who made 12 Premier League appearances for the Premier League club during a successful loan spell at St James' Park, was bought from Czech club Sparta Prague.
Manager Rafael Benitez told the club's website: "Ever since he arrived with us on loan he has shown a fantastic attitude and great work ethic, and of course we have been very impressed with his performances for us on the pitch last season.
"This was one of the key positions we had identified we needed to strengthen and had been concerned about, so it is excellent news that we are able now to sign him on a permanent basis.