Millwall have not conceded a goal in the games Bolder has played in
QPR midfielder Adam Bolder is staying at Millwall on loan for another month.
The 28-year-old, who has been ever-present since moving to the Den, will now stay until 3 January.
Millwall are unbeaten in the five games Bolder has played in, having claimed four wins and one draw without conceding a goal.
Millwall skipper Paul Robinson told the club's website: "He's a calm head in midfield, gives protection to the back four and is a good passer of the ball."
Bolder had only made one appearance for Queens Park Rangers this season before his loan move to Millwall in early November.
He has reportedly said he would consider a permanent move to south London, depending on where the club are in January.
The Lions are currently third in the League One table, just two points behind leaders Leicester City.
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