Millwall have signed midfielder Richard Chaplow on loan from Southampton for the remainder of the season.
The 28-year-old could make his debut for the Lions in Saturday's Championship derby at The Valley and will be available for the FA Cup semi-final against Wigan next month, as well as the final on May 11 if Millwall defeat the Latics.
Chaplow made three starts in the Capital One Cup for Saints earlier this season but has had to settle for three appearances off the bench in the Premier League, the last of them coming in the 2-2 draw at Chelsea on January 16.
Chaplow started his career at Burnley before moving to West Brom for ?1.5m in January 2005. He then joined Preston before signing for Southampton in January 2011.
Meanwhile, Millwall have rearranged their Championship home game against Crystal Palace for Tuesday April 30 (7.45pm).
The match was originally scheduled to be played on Saturday April 13 but the Lions will be playing Wigan in their FA Cup semi-final that weekend.
Oxford striker Jon-Paul Pittman could make a welcome return to action.
The former Crawley and Wycombe forward has been missing since December after dislocating a shoulder and, having worked hard to return to full fitness, he has trained every day this week with no adverse reaction.
"He has done really well," assistant manager Mickey Lewis told the club's official website. "He looks strong and is up to just about full speed in training, so he is very much in our thoughts for the run-in."
Liam Davis and Deane Smalley both stepped off the bench in the 1-0 victory over Barnet in midweek and they are pushing for starts as Oxford look for their fourth win in five games.
The U's remain without long-term injury victims goalkeeper Ryan Clarke (shoulder), striker Justin Richards (knee) and midfielder Peter Leven (knee).
Drew Talbot comes back into the reckoning for Chesterfield.
Talbot missed the 2-0 home win over Bristol Rovers last Saturday with a virus.
The 26-year-old could be considered for a spot at full-back or on the wing, meaning Richard Brindley and Conor Townsend are the players most under threat in the starting line-up.
Tendayi Darikwa continued his return to fitness following a double hernia operation with a run-out for the reserves this week and the winger is also back in contention for a starting role.
Oxford include three former Spireites among their ranks in Deane Smalley, Andy Whing and Peter Leven, although the latter is out with a knee injury.
Chesterfield really need to win to keep their fading play-off hopes alive.
