Blackpool's Michael Jackson came off the bench to seal a 2-1 extra-time victory at home to Southend in the Carling Cup third round.

Seasiders manager Simon Grayson rested six players for the Championship side and almost paid for it as Southend, who knocked out Manchester United to reach last season's quarter-finals, looked set for another fourth-round appearance following Matt Harrold's sixth-minute penalty at Bloomfield Road.

But Blackpool striker Scott Vernon struck an 81st-minute equaliser to spare the Championship side's blushes and take the game into extra-time.

Defender Jackson was then belatedly brought into the fray and with a penalty shoot-out looming, stabbed home the winner three minutes from time after Southend failed to clear Andy Welsh's corner.