Defender Sean Long has returned to Reading following the end of his Luton loan spell, the Sky Bet League 2 club have announced.
The 20-year-old full-back, who has yet to make a league appearance for Reading, played 11 times for the Hatters.
Long made his debut in the 2-1 defeat at Crawley in October and played for the final time in last week's goalless draw at Portsmouth.
Luton, meanwhile, have recalled Luke Trotman and Isaac Galliford from respective youth loans at Histon and St Neots.