Manchester United have identified Crystal Palace's English full-back Aaron Wan-Bissaka, 21, Napoli and Senegal defender Kalidou Koulibaly, 27, and Barcelona's Croatian midfielder Ivan Rakitic, 30, as their main summer transfer targets.

Kalidou Koulibaly has stoked potential rumours over a move to Manchester United after his agent claimed the centre-back would never 'betray' Napoli by joining Serie A rivals Juventus.

Manchester United have four main transfer targets this summer - defenders Kalidou Koulibaly, 27, of Napoli, Lucas Hernandez, 22, of Atletico Madrid and Fiorentina's Nikola Milenkovic, 21, plus Juventus winger Douglas Costa, 28.

Manchester United are weighing up summer moves for three Serie A defenders - Napoli's Kalidou Koulibaly, Inter's Milan Skriniar and Sampdoria's Joachim Andersen.

Manchester United are determined to step up their efforts to sign Napoli defender Kalidou Koulibaly.