Premier League youngster Aaron Ramsey has joined the club on loan until the end of the season, subject to clearance.
The Aston Villa midfielder completed the formalities of his move on transfer deadline day.
The 20-year-old England youth international had spent the first part of the season on loan at Norwich, but he returned to Villa for his rehab after suffering a knee injury in December.
He made 20 appearances for the Canaries and scored three goals.
The exciting youngster, who joined Villa at the age of nine, made his only senior appearance for the club alongside Cameron Archer, who joined Boro on loan earlier this month.
Aaron also made appearances for Cheltenham Town while on loan with the club last season.
He becomes the third signing of the January transfer window, joining Villa team-mate Archer and Dan Barlaser.