By Josh James at Emirates Stadium
Summary
Long-range strikes from Jordy Clasie and Ryan Bertrand have given Southampton a 2-0 half-time lead, leaving the Gunners with a mountain to climb to stay in the EFL Cup.
Setting the scene
A place in the last four of the League Cup – for the first time since 2011 – was the prize, if Arsenal could extend their unbeaten sequence to 20 matches.
The Gunners had already seen off Southampton once during that undefeated run, back in September, but it was a very different team that lined up for the EFL Cup game this time around.