Southend United are leading Millwall 2-0 at half time.
The Blues scored in the 22nd minute against the East London side, courtesy of a Barry Corr header.
The game was then postponed for a quarter-of-an-hour as Roots Hall experienced a floodlight failure. However, the issue was soon fixed, and the game resumed.
Millwall were reduced to 10 men as Jermaine Easter was sent off at the end of the first half, before a goal by Will Atkinson made it 2-0 to the Essex side.