Queens Park Rangers youngster Michael Harriman has extended his loan with Luton Town until January 10.
The 22-year-old defender has made 10 appearances for the Hatters since he joined the League Two club two months ago.
Harriman has previously been on loan at St Albans City, Wycombe Wanderers and Gillingham.
"Michael has been exceptional since joining us. He has slotted in like he has been with us for years," manager John Still told the club's official website. "We'd love to keep Michael for longer and we'll revisit that."
Luton are back in action on Saturday when they make the trip to Morecambe in the league.