Last updated on .From the section League Cup

League One Oxford United celebrate Liam Sercombe's winner against Championship side Birmingham City

Liam Sercombe grabbed the extra-time winner as Oxford knocked 2011 winners Birmingham City out of the EFL Cup.

The Blues made six changes to the side held to a goalless draw by Cardiff on Saturday, and dominated the first half.

But Alex MacDonald worked hard to keep Oxford moving forward as the game wandered aimlessly into extra time.

Sercombe was positioned perfectly to head home a left-wing cross two minutes from time as Oxford, newly-promoted to League One, reached the second round.