Manchester United interim boss Ralf Rangnick feels that most aspects of the team need changing in the summer.
Rangnick spoke after his side's biggest win during his interim period.
The Red Devils bested Brentford 3-0 at home on Monday night in the Premier League.
Rangnick told Sky Sports: "Apart from goalkeeping where we have three excellent goalkeepers in Tom Heaton, Dean Henderson and David de Gea, in all other areas there will be players leaving the club. I wouldn't put focus on special areas of the pitch - it should go through the whole team."
He added: "So far we haven't been able to speak [to Ten Hag]. Erik's focus is on winning the Dutch league, our focus was on our games.
"It's obvious quite a few players will leave and there is a need for top-quality players. I strongly believe that if everyone works together we can bring Man Utd back to where we need to be.
"Other clubs only needed two or three transfer windows to challenge but from now on we need to bring in top-quality players who really help raise the level. If this happens then I don't think it should take too long."
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