Town have confirmed that full-back Liam Rosenior can face his parent club Reading when the Blues travel to the Madejski Stadium on Saturday.
Rosenior joined the Blues from the Royals on a season-long loan in August and the terms of that agreement allow the 25-year-old to take on his other team-mates at the weekend.
The only previous occasion that a loan player has played against his parent club while with Town was in November 2001 when Sixto Peralta helped the Blues to a 1-0 victory over Inter Milan in the first leg of a UEFA Cup third round tie at Portman Road.