Ralph Hasenhuttl says it is obvious Southampton must fix their leaky defence.
Saints finished the 2021/22 in 15th on the table despite giving away the second most amount of goals in the league.
"I think it is not so difficult to analyse this season, to be honest," said Hasenhuttl after the loss to West Ham United on Sunday.
"When you concede the second-most goals in the Premier League then we know very clear what is missing at the moment.
"When you see from what chances that they (West Ham) make goals against us, I mean, I have never seen us conceding so easily.
"But, okay, this is what we know, this is what we have to change. Either with these players or with others."
