Maya Yoshida says it is important Southampton finish the job in Group K of the UEFA Europa League and make sure they do not waste the good work they have done to this point.
Saints head to Sparta Praha for Thursday night’s fixture knowing that a win could send them into the knockout stages.
Their opponents currently lead the group on nine points, with Claude Puel’s side two points behind them, in second place.
If Saints triumph at Generali Arena, and Hapoel Be’er Sheva fail to beat Internazionale at home, then a place in the last 32 will be secured.
"We are almost through to the next round, but these winning points are really important for us,” said Yoshida, who has started all four of the team’s European matches this season.
“We have to make sure we get these points and go through to the next round.”
Saints won 3-0 at St Mary’s when the sides met during the first round of Group K matches, but Yoshida feels their opponents – who have won all three of their games in the competition since then – will pose a tougher test.
"We already played against them at home, so we know about them,” he said.
“I think it's going to be very, very tough, especially an away game against them – maybe a different atmosphere in the stadium, so we have to be ready for that.
"I thought they were a good team and they have good motivation, because for them playing Europa League is very, very important. But, for us also, it's very important.”