Lenny Agbaire has left Celtic for an undisclosed fee.
Rotherham United have confirmed the capture of the powerful centre-back.
The defender, 20, spent time on loan with Scott Brown at Ayr United last season.
He has now been sold by the Scottish Premiership champions.
A statement reads: "Rotherham United are delighted to confirm the signing of young and exciting defender Lenny Agbaire who joins for an undisclosed fee from Celtic, subject to EFL and FA ratification and international clearance.
"The 20-year-old defender arrives at AESSEAL New York Stadium on a deal until the summer of 2028 to bolster Matt Hamshaw's defensive options.
"Agbaire makes the trip south of the Scottish border for the first time in his career, having been a part of the Celtic youth system for close to a decade since the age of 10, joining in August 2015.
"He worked his way into the Celtic B side, where he became a regular in the squad and played a key role in helping the side lift the Scottish FA Youth Cup.
"His impressive displays at youth level earned him a loan move to Scottish Championship side Ayr United, where he made 16 appearances from January 2025 onwards and helped the side reach the Scottish Championship Play-offs.
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"Agbaire has had the opportunity to meet his new teammates at Roundwood but has been unable to feature in training as of yet, with the club awaiting the receipt of relevant permissions and clearance,s which have now been granted.
"Paperwork has been completed in time for Matt Hamshaw's latest addition to feature in this evening's friendly fixture against Harrogate Town, where Millers fans will have a first opportunity to potentially see the newest summer recruit in action.
"Reaction from Matt Hamshaw and Lenny Agbaire will follow after the match."
