Centre-back becomes Millwall's second signing of the day
Millwall have signed Jake Cooper from Sky Bet Championship side Reading.
Standing at 6'6", the highly-rated central-defender has joined The Lions on loan until the end of the season.
Starting his career rising through the ranks at the Berkshire club, Cooper has made 30 appearances for The Royals, scoring four goals.
A current England Under 20 international, the defender has received call-ups for the Under 18 side and led from the back as Reading's Academy reached the Elite League Final in 2012/13.
Powerful at the back and assured with his feet, Cooper will train with his new team-mates on Friday, with a view to being involved in Millwall's squad for this weekend's trip to Bradford City.
He will wear squad number 24.