Speaking to Sky Sports, Ashley Young said: "I said it at the time, I couldn’t understand the decision [to sell Romelu Lukaku].
"Whether it was made quickly or not, Romelu has proved a lot of people wrong. He's worked unbelievably hard.
"There was talk that he was overweight and couldn't do this or that. He's smashed record and made history in Italy, he's been unbelievable for the club.
"For me he was fantastic even in the Premier League, to go out there and face another challenge, I think it was the right choice for him. He deserves all the plaudits he is getting."
Lukaku left Manchester United in the summer of 2019 with Ole Gunnar Solskjaer putting his faith in Marcus Rashford, Anthony Martial and Mason Greenwood.
Young, a former Red Devils' skipper, joined the Belgian at Inter Milan in January 2020 with the Nerazzurri securing the 2020/21 Serie A title under Antonio Conte.
