Derby County have completed the signing of Barnsley centre-half Jason Shackell on a three-year contract.
The fee for the the 27-year-old has not been revealed but BBC Radio Derby understands it is in excess of £1m.
Shackell told BBC Radio Derby: "It's the right place at the right time. It's a good fit at this stage of my career.
"The manager is looking to push on. They have been active in the transfer window and I am ambitious and want to play at the highest level I can."
Rams boss Nigel Clough said: "Jason brings leadership and experience and it is a tremendous signing.
"We have had to beat off stiff competition and we believe he will have a big part to play in our coming season and our future."
Shackell, who began his career with Norwich and has also had spells with Wolves and Doncaster, joined Barnsley in the summer of 2010.
He played 46 games as captain of the Tykes last term and was named their player of the season.
Clough added: "He is in the prime of his career and was Barnsley's stand-out player last season, as well as being one of the most impressive defenders in the Championship.
"Having watched him a lot last season, it's clear he is a player who lives to defend."
The Rams first expressed an interest in Shackell in May, however any move was put on hold until the then-managerless Tykes appointed a new boss.
But with Keith Hill in place, the Rams were able to wrap up the signing.