Ronald Koeman has praised his side for keeping their first clean sheet of the season in the goalless draw with Watford.
Both sides had chances to win the match at Vicarage Road late on, but the teams shared the points, leaving Southampton 18th in the table.
After the match, the manager told reporters: "We played a little bit different than the first two games because we had to be defensively better. In my opinion, it always starts at the back and at least we had our first clean sheet of the season.
"One of the key points of last season was that we had a strong defensive organisation. We know we have to deal with speculation over our players. Again, no-one is for sale. Everyone stays at Southampton. We want to bring in another defender."
Southampton are still looking for their first win of the campaign, following a draw with Newcastle United and defeat to Everton.
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