Aston Villa manager Paul Lambert called for an immediate response from his players after they conceded four second-half goals at Southampton.
Lambert's men led 1-0 at half-time though Darren Bent's toe-poked effort but capitulated after the break and went down to a 4-1 defeat at St Mary's.
"If you're not bang at it, that's what can happen," he said.
"We deserved to go one-up at half-time but you have to sustain that. In the second half it wasn't good enough."
Lambert now wants his side to pick themselves up ahead of a trip to the Etihad Stadium on Tuesday night to face Manchester City in the Capital One Cup, before a local derby against West Brom on Saturday.
"Now we pick ourselves up and go again. I never get too high when we win and I never get too despondent when we lose," he said.
"They [the players] gave us the effort and I can't fault that. We will keep cracking on.
"It's important to try and keep a level head. It's a long, long season and I'm sure there will be ups and downs."