Also discussed was Martial.
The France international was tipped for the top when he signed for the club from Monaco back in 2015, when Louis van Gaal ruled the roost.
Yet Martial’s time at Old Trafford has been hampered by inconsistency, leading to talk he could leave the Red Devils in January.
Sevilla appear to be the new frontrunners in the race to clinch his signature, with Barcelona, Newcastle and Juventus also being linked.
And Silvestre has urged Martial to improve his form in training, while also suggesting a move away could be best.
He added: “I know what it’s like when you feel you’re not loved or appreciated, you feel a need to move on.