Millwall goalkeeper Tom King has signed a new deal until 2019 – and joined Stevenage on loan.
The 22-year-old has made two appearances for the Lions this season in the Carabao Cup.
He is behind Jordan Archer and David Martin in the pecking order, but will get valuable first-team minutes with Stevenage.
The Boro are 15th in League Two, looking to push on to the play-offs.
King is available for their FA Cup clash against Reading this weekend. His loan deal runs until the end of the season.
He featured 11 times in League One last season as Millwall won promotion to the Championship.
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