The defender says they must focus on improving defensively after conceding five goals in two games.
Two goals from Romelu Lukaku and a late third from Ross Barkley gave Roberto Martinez’s side a comfortable 3-0 win at St Mary’s Stadium, as they left with all three points from an impressive display.
It was a disappointing display from Ronald Koeman’s side in their first home game of the season, with them failing to properly test the Toffees, and Yoshida says it was the same mistakes as last week against Newcastle that cost them.
“Nobody expected it to go like this because it was our opening home game,” Yoshida told Southampton’s official website.
“We made completely the same mistake as last Sunday against Newcastle from the set-piece. The second goal was a mistake. It was too easy to concede the goals and I think Everton played like we wanted to play. They deserved to win the game.”
It has been a disappointing start to the new season for Koeman’s side, with their defence looking a particular problem to be worked on.
They have already conceded five goals in two games, with the 3-0-draw coming after the 2-2 draw with Newcastle in their opening game. That will be a big concern for them as well, given they boasted one of the league’s defensive records last season.
It may come as little surprise though, given they have lost both Toby Alderweireld and Nathaniel Clyne this summer and a new defence needing time to settle and adapt.
And Yoshida says they must improve on a lot of things ahead of Thursday’s Europa League clash with FC Midtyjlland.
“We have to concentrate to make a clean sheet,” he added.
“We need to be more compact, more solid physically and tactically we need to be more intelligent. We need to improve a lot of things. We will talk about the previous game, with the coaching staff and the team. We have to talk and I hope we can get our confidence back on Thursday."