Oxford have signed Burton's Justin Richards and Gillingham's Lewis Montrose on loan and handed Josh Parker a deal until the end of the season.
Forward Richards, 32, had a previous three-month loan spell at Oxford in 2008, scoring one goal in 15 appearances, and joins for a month.
Midfielder Montrose, 24, has played 18 times for the Gills this term and joins Oxford for the rest of the season.
Parker, 22, joined the U's on non-contract terms in December.
The former Oldham man has made three substitute appearances so far, all in victories.
Former Bristol Rovers, Woking, Kidderminster, Cheltenham and Port Vale front man Richards will provide cover for the suspended James Constable, who is banned for four games.