Southampton boss Tonda Eckert said that their loss at Oxford United on boxing day was "disappointing".
The hosts took the lead thanks to a strike by Tyler Goodrham before Saints levelled prior to half time through Taylor Harwood-Bellis.
Stan Mills then ran through to score a dramatic late winner and claim all three points for managerless Oxford.
"It's disappointing because we wanted to start this block of games well," Eckert said after the match.
"We lost the calmness a little bit which is something you need in games like that, it continued in the second half and was a very open game.