The Serbia midfielder opened the scoring for the Saints at St Mary's on Sunday, before the England striker grabbed a second-half brace and club captain Steven Davis rounded off the scoring.
Gyfli Sigurdsson had cancelled out Dusan Tadic's opener for Southampton in spectacular fashion on the stroke of halftime but the Premier League's leakiest defence then gave up three second-half goals as the Saints cruised to victory. Currently sat 14th in the table, the South Coast club have been a team in freefall since the end of September, picking up a 1-0 win over West Brom last month, that is Southampton's only win in their last seven attempts. "I will back the board whatever they decide to do and what is best for the football club is what I want". "But when we go into a game situation, because our confidence is low, we are conceding far too easily".
"Players need to take responsibility - senior players, foreign players, young players".
"We're in a tough moment and we're desperate to get back to some home comforts and play in front of our home fans".
Southampton started the stronger of the two sides, establishing the pattern of home dominance that would persist throughout the match.
The hosts continued to make the early running and Austin struck the right-hand upright after connecting with Cedric Soares's cross from the right. If it's the one that shows some fight we can definitely get the win against this Everton side.
The Premier League match between Southampton and Everton will be broadcast online.
Farhad Moshiri insists the club are "close" to appointing a new manager, but that won't come before Sunday's trip to Southampton.
The result was the heaviest home defeat by an English side in the various guises of this competition since Nottingham Forest lost by the same scoreline to Bayern Munich in 1996 and one point from five matches extends the worst Europa League record by an English side. After plenty of activity in the transfer window and former Saints manager Ronald Koeman getting the boot, interim manager David Unsworth has to turn things around quickly.