Manchester United need to sign more world-class players if they want to compete in the Premier League and Europe, according to Nani.
United are facing a big off-season after failing to qualify for the Champions League, having finished sixth and 32 points adrift of winners Manchester City in 2018-19.
Ander Herrera and Antonio Valencia have already confirmed their Old Trafford departures, while the futures of Paul Pogba, Romelu Lukaku, Alexis Sanchez, David de Gea and Juan Mata are uncertain.
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United have been linked with Ajax captain Matthijs de Ligt, Benfica sensation Joao Felix, Real Madrid outcast Gareth Bale and Paris Saint-Germain full-back Thomas Meunier as Ole Gunnar Solskjaer tries to rebuild his squad.