Liverpool defender Andy Robertson has claimed Scotland teammate Scott McTominay has proven Manchester United were wrong to sell him to Napoli last summer after a stellar debut season in Italy. McTominay joined Napoli from United on the final day of last summer's transfer window and scored 12 league goals to help fire them to a second Serie A title in three seasons. McTominay had entered the final year of his contract at Old Trafford and his stock was high following a ten-goal haul for United in the 2023/24 campaign. United sold him for a fixed fee of £25.7million. Former United manager Erik ten Hag did not want to lose the Scotland international, but United decided to sell him as the money earned from his departure counted as 'pure profit' towards the profit and sustainability rules [PSR]. As a result of his 13-goal haul across all competitions for Napoli this term, United have been questioned for making the decision to sell him. And in the opinion of Robertson, McTominay never got the opportunity to get a consistent run of games at Old Trafford. "I think he went over there with a point to prove," Robertson said. "He wanted to prove Man Utd wrong and prove people in the Premier League wrong, and he's gone over there and done that pretty successfully. "That's credit to him, credit to his attitude and his determination to be the best version of himself. Now he's a king over there. "At Man United he probably lacked getting that run of games consistently, he was in and out and things like that. He probably didn't get the respect he deserves. "Then he goes over there, puts in a magnificent season and, fair play to him, he ends it with the league title." Here at the Manchester Evening News, we're dedicated to bringing you the best Manchester United coverage and analysis. Make sure you don't miss out on the latest United news by joining our free WhatsApp group. You can get all the breaking news and best analysis sent straight to your phone by clicking here to subscribe. You can also subscribe to our free newsletter service. Click here to be sent all the day's biggest stories. And finally, if you'd rather listen to our expert analysis then make sure to check out our Manchester is Red podcast, featuring The Samuel Luckhurst Show and The Midweek Debate. Our shows are available on all podcast platforms, including Spotify and Apple Podcasts , and you can also watch along on YouTube .