A Jed Wallace brace helped Millwall thrash sorry Northampton to bolster their Sky Bet League One play-off hopes, running out 3-0 winners at the Den.

The hosts flew into a three-goal lead before the break with Aiden O'Brien also on the scoresheet as the Lions held onto the final play-off spot - one point above seventh-placed Southend with three games left.

Millwall striker Lee Gregory saw an early shot strike the post as Northampton struggled to gain a foothold.

O'Brien opened the scoring in spectacular fashion on 27 minutes, lashing in a sublime first-time volley off the bar from just inside the box after neat interplay with Joe Martin.

Ten minutes later Wallace struck a magnificent 25-yard effort which arrowed into the top corner, giving visiting keeper Adam Smith no chance.

Wallace got his second just before half-time, striking home from eight yards after O'Brien's neat cut-back from the by-line.

The Lions continued to attack in the second half but could not add to their tally as the Cobblers defence performed damage limitation to stifle the hosts.