Ralph Hasenhuttl wants to add some quality to his squad this summer and is keen to ensure Southampton are not involved in another relegation battle.
The former RB Leipzig boss says he has "a very clear picture" of what Saints, who drew 1-1 with Huddersfield Town on the final day of the Premier League campaign, need.
Southampton flirted with relegation for the second season in a row and, although they eventually finished 16th, five points clear of the bottom three, Hasenhuttl is desperate to make sure they are not involved in another struggle to avoid the drop in 2019/20.
The Austrian said: "It is a very clear picture for me now what we are still missing in our game. Maybe we know that we only win games when we have the perfect commitment and shape and work perfect together.
"If there are a few guys not 100 per cent in the right direction then we are struggling always.
"That means we need more quality next season. It will be a difficult summer for sure because we have our limits with transfer fees and things like that but we must be clear that we have to make a few new players in the team.
"We need to create a new spirit and new mentality because we must give a different picture from the first game day. That's the goal and a clear message for the summer and we will work on this."
Southampton are 1/7 not to be relegated next season while Sheffield United can be backed at 6/5.