Rodgers: We needed Luis Suarez
Brendan Rodgers believes Liverpool missed the banned Luis Suarez, as Southampton condemned them to a first defeat of the season.
Dejan Lovren scored the second-half winner as Liverpool lost for the first time in six months.
With Suarez having completed his 10-match suspension for biting Chelsea's Branislav Ivanovic last season, Rodgers admitted the Reds did not threaten the visitors' goal enough.
"Sometimes players like him who are magical can make the difference in games like this," Rodgers said. "The big positive from today is the fact he is back and the ban is finished."
Suarez can make his return in Wednesday's Capital One Cup tie against Manchester United at Old Trafford, and Rodgers believes Suarez is in the right shape to excel.
"He is in good condition. He has been playing games behind closed doors and doing specific work with the conditioning team," Rodgers said. "He's a worker and a fighter, and he just needs to get games to bring him up to full speed."
Rodgers said he was unhappy with his side's performance and the result against Southampton.
"Both were very disappointing. We never got going from the off. It was a bit lethargic," he said. "Technically, we were short, and we looked flat and slow in our game."
The Liverpool boss picked a defence with four specialist centre-backs and still conceded from a corner, with Lovren heading in his first Saints goal.
"We gave away a really poor goal," Rodgers said. "To lose a goal like that was criminal."
Southampton manager Mauricio Pochettino, though, was full of praise for his team and in particular goalkeeper Artur Boruc.
"He was great," Pochettino said. "Our performance was outstanding."