Left-back Tyrone Mings has signed a new contract until June 2017. The 21-year-old was offered the new terms after the Blues turned down Crystal Palace's £3 million deadline day offer.
"We’ve been delighted with the progress Ty has made and his contract is reward for getting in the team and doing well,” manager Mick McCarthy told the club site.
"Palace did make a big offer for him but we want him here long term. I want to keep our young, exciting players and Ty is one of them.”
Mings, whose previous contract ran until the summer of 2015 plus an option for a further year, joined the Blues from non-league Chippenham for £10,000 in December 2012 and has now made 13 starts and 13 sub appearances.